Revert "Add WEB session tag for brower's power hint session control."

Revert submission 30772387-web-session-tag

Reason for revert: New feature request have to go through Android FR process.

Reverted changes: /q/submissionid:30772387-web-session-tag

Change-Id: Ifdfb8af39ae05552d79f3fc7f303e884e129f679
diff --git a/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/SessionTag.aidl b/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/SessionTag.aidl
index 62a84c7..71da2d4 100644
--- a/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/SessionTag.aidl
+++ b/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/SessionTag.aidl
@@ -40,5 +40,4 @@
   GAME,
   APP,
   SYSUI,
-  WEB,
 }
diff --git a/power/aidl/android/hardware/power/SessionTag.aidl b/power/aidl/android/hardware/power/SessionTag.aidl
index d1663a8..e98cc77 100644
--- a/power/aidl/android/hardware/power/SessionTag.aidl
+++ b/power/aidl/android/hardware/power/SessionTag.aidl
@@ -51,9 +51,4 @@
      * This tag is used to mark hint sessions created by the system UI.
      */
     SYSUI,
-
-    /**
-     * This tag is used to mark hint sessions created by the web browers.
-     */
-    WEB,
 }