Revert "Move SettingsProxyExt content observer registration call on bg thread."

This reverts commit 0ccaa029c98b89c68c989b0b0436b63157c58acf.

Reason for revert: Droidmonitor triggered revert due to b/357575679.

Change-Id: Icbe8ba2723b1d2a44ce4d3853ef2cfcb5360039a
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index 22bfe90..201aaed 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -1304,14 +1304,4 @@
    namespace: "systemui"
    description: "Adding haptic component infrastructure to sliders in Compose."
    bug: "341968766"
-}
-
-flag {
-  namespace: "systemui"
-  name: "settings_ext_register_content_observer_on_bg_thread"
-  description: "Register content observer in callback flow APIs on background thread in SettingsProxyExt."
-  bug: "355389014"
-  metadata {
-    purpose: PURPOSE_BUGFIX
-  }
 }
\ No newline at end of file
diff --git a/packages/SystemUI/multivalentTests/src/com/android/systemui/util/settings/SettingsProxyExtTest.kt b/packages/SystemUI/multivalentTests/src/com/android/systemui/util/settings/SettingsProxyExtTest.kt
deleted file mode 100644
index e281894..0000000
--- a/packages/SystemUI/multivalentTests/src/com/android/systemui/util/settings/SettingsProxyExtTest.kt
+++ /dev/null
@@ -1,165 +0,0 @@
-/*
- * Copyright (C) 2024 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.android.systemui.util.settings
-
-import android.database.ContentObserver
-import android.platform.test.annotations.DisableFlags
-import android.platform.test.annotations.EnableFlags
-import androidx.test.ext.junit.runners.AndroidJUnit4
-import androidx.test.filters.SmallTest
-import com.android.systemui.Flags
-import com.android.systemui.SysuiTestCase
-import com.android.systemui.coroutines.collectLastValue
-import com.android.systemui.kosmos.testScope
-import com.android.systemui.testKosmos
-import com.android.systemui.util.settings.SettingsProxyExt.observerFlow
-import kotlinx.coroutines.ExperimentalCoroutinesApi
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.test.runCurrent
-import kotlinx.coroutines.test.runTest
-import org.junit.Before
-import org.junit.Test
-import org.junit.runner.RunWith
-import org.mockito.Mock
-import org.mockito.MockitoAnnotations
-import org.mockito.kotlin.any
-import org.mockito.kotlin.times
-import org.mockito.kotlin.verify
-
-/** Tests for [SettingsProxyExt]. */
-@RunWith(AndroidJUnit4::class)
-@SmallTest
-@OptIn(ExperimentalCoroutinesApi::class)
-class SettingsProxyExtTest : SysuiTestCase() {
-    private val kosmos = testKosmos()
-    private val testScope = kosmos.testScope
-    @Mock lateinit var settingsProxy: SettingsProxy
-    @Mock lateinit var userSettingsProxy: UserSettingsProxy
-
-    @Before
-    fun setUp() {
-        MockitoAnnotations.initMocks(this)
-    }
-
-    @Test
-    @EnableFlags(Flags.FLAG_SETTINGS_EXT_REGISTER_CONTENT_OBSERVER_ON_BG_THREAD)
-    fun observeFlow_bgFlagEnabled_settingsProxy_registerContentObserverInvoked() =
-        testScope.runTest {
-            val unused by collectLastValue(settingsProxy.observerFlow(SETTING_1, SETTING_2))
-            runCurrent()
-            verify(settingsProxy, times(2))
-                .registerContentObserver(any<String>(), any<ContentObserver>())
-        }
-
-    @Test
-    @DisableFlags(Flags.FLAG_SETTINGS_EXT_REGISTER_CONTENT_OBSERVER_ON_BG_THREAD)
-    fun observeFlow_bgFlagDisabled_multipleSettings_SettingsProxy_registerContentObserverInvoked() =
-        testScope.runTest {
-            val unused by collectLastValue(settingsProxy.observerFlow(SETTING_1, SETTING_2))
-            runCurrent()
-            verify(settingsProxy, times(2))
-                .registerContentObserverSync(any<String>(), any<ContentObserver>())
-        }
-
-    @Test
-    @EnableFlags(Flags.FLAG_SETTINGS_EXT_REGISTER_CONTENT_OBSERVER_ON_BG_THREAD)
-    fun observeFlow_bgFlagEnabled_channelClosed_settingsProxy_unregisterContentObserverInvoked() =
-        testScope.runTest {
-            val job = Job()
-            val unused by
-                collectLastValue(settingsProxy.observerFlow(SETTING_1, SETTING_2), context = job)
-            runCurrent()
-            job.cancel()
-            runCurrent()
-            verify(settingsProxy).unregisterContentObserverAsync(any<ContentObserver>())
-        }
-
-    @Test
-    @DisableFlags(Flags.FLAG_SETTINGS_EXT_REGISTER_CONTENT_OBSERVER_ON_BG_THREAD)
-    fun observeFlow_bgFlagDisabled_channelClosed_settingsProxy_unregisterContentObserverInvoked() =
-        testScope.runTest {
-            val job = Job()
-            val unused by
-                collectLastValue(settingsProxy.observerFlow(SETTING_1, SETTING_2), context = job)
-            runCurrent()
-            job.cancel()
-            runCurrent()
-            verify(settingsProxy).unregisterContentObserverSync(any<ContentObserver>())
-        }
-
-    @Test
-    @EnableFlags(Flags.FLAG_SETTINGS_EXT_REGISTER_CONTENT_OBSERVER_ON_BG_THREAD)
-    fun observeFlow_bgFlagEnabled_userSettingsProxy_registerContentObserverForUserInvoked() =
-        testScope.runTest {
-            val unused by
-                collectLastValue(userSettingsProxy.observerFlow(userId = 0, SETTING_1, SETTING_2))
-            runCurrent()
-            verify(userSettingsProxy, times(2))
-                .registerContentObserverForUser(any<String>(), any<ContentObserver>(), any<Int>())
-        }
-
-    @Test
-    @DisableFlags(Flags.FLAG_SETTINGS_EXT_REGISTER_CONTENT_OBSERVER_ON_BG_THREAD)
-    fun observeFlow_bgFlagDisabled_userSettingsProxy_registerContentObserverForUserInvoked() =
-        testScope.runTest {
-            val unused by
-                collectLastValue(userSettingsProxy.observerFlow(userId = 0, SETTING_1, SETTING_2))
-            runCurrent()
-            verify(userSettingsProxy, times(2))
-                .registerContentObserverForUserSync(
-                    any<String>(),
-                    any<ContentObserver>(),
-                    any<Int>()
-                )
-        }
-
-    @Test
-    @EnableFlags(Flags.FLAG_SETTINGS_EXT_REGISTER_CONTENT_OBSERVER_ON_BG_THREAD)
-    fun observeFlow_bgFlagEnabled_channelClosed_userSettingsProxy_unregisterContentObserverInvoked() =
-        testScope.runTest {
-            val job = Job()
-            val unused by
-                collectLastValue(
-                    userSettingsProxy.observerFlow(userId = 0, SETTING_1, SETTING_2),
-                    context = job
-                )
-            runCurrent()
-            job.cancel()
-            runCurrent()
-            verify(userSettingsProxy).unregisterContentObserverAsync(any<ContentObserver>())
-        }
-
-    @Test
-    @DisableFlags(Flags.FLAG_SETTINGS_EXT_REGISTER_CONTENT_OBSERVER_ON_BG_THREAD)
-    fun observeFlow_bgFlagDisabled_channelClosed_userSettingsProxy_unregisterContentObserverInvoked() =
-        testScope.runTest {
-            val job = Job()
-            val unused by
-                collectLastValue(
-                    userSettingsProxy.observerFlow(userId = 0, SETTING_1, SETTING_2),
-                    context = job
-                )
-            runCurrent()
-            job.cancel()
-            runCurrent()
-            verify(userSettingsProxy).unregisterContentObserverSync(any<ContentObserver>())
-        }
-
-    private companion object {
-        val SETTING_1 = "settings_1"
-        val SETTING_2 = "settings_2"
-    }
-}
diff --git a/packages/SystemUI/src/com/android/systemui/util/settings/SettingsProxyExt.kt b/packages/SystemUI/src/com/android/systemui/util/settings/SettingsProxyExt.kt
index 36468144..d757e33 100644
--- a/packages/SystemUI/src/com/android/systemui/util/settings/SettingsProxyExt.kt
+++ b/packages/SystemUI/src/com/android/systemui/util/settings/SettingsProxyExt.kt
@@ -19,7 +19,6 @@
 
 import android.annotation.UserIdInt
 import android.database.ContentObserver
-import com.android.systemui.Flags
 import com.android.systemui.common.coroutine.ConflatedCallbackFlow.conflatedCallbackFlow
 import kotlinx.coroutines.channels.awaitClose
 import kotlinx.coroutines.flow.Flow
@@ -40,21 +39,9 @@
                     }
                 }
 
-            names.forEach { name ->
-                if (Flags.settingsExtRegisterContentObserverOnBgThread()) {
-                    registerContentObserverForUser(name, observer, userId)
-                } else {
-                    registerContentObserverForUserSync(name, observer, userId)
-                }
-            }
+            names.forEach { name -> registerContentObserverForUserSync(name, observer, userId) }
 
-            awaitClose {
-                if (Flags.settingsExtRegisterContentObserverOnBgThread()) {
-                    unregisterContentObserverAsync(observer)
-                } else {
-                    unregisterContentObserverSync(observer)
-                }
-            }
+            awaitClose { unregisterContentObserverSync(observer) }
         }
     }
 
@@ -70,21 +57,9 @@
                     }
                 }
 
-            names.forEach { name ->
-                if (Flags.settingsExtRegisterContentObserverOnBgThread()) {
-                    registerContentObserver(name, observer)
-                } else {
-                    registerContentObserverSync(name, observer)
-                }
-            }
+            names.forEach { name -> registerContentObserverSync(name, observer) }
 
-            awaitClose {
-                if (Flags.settingsExtRegisterContentObserverOnBgThread()) {
-                    unregisterContentObserverAsync(observer)
-                } else {
-                    unregisterContentObserverSync(observer)
-                }
-            }
+            awaitClose { unregisterContentObserverSync(observer) }
         }
     }
 }