Remove unnecessary permission mock for registerSystemDefaultNetwork

registerSystemDefaultNetwork now can be accessed via
CONNECTIVITY_USE_RESTRICTED_NETWORKS, there is no need
to mock NETWORK_SETTINGS prior to test.

Test: atest com.android.server.ConnectivityServiceTest
Change-Id: I408094959286f3782496ce7f356f84a6a47c0902
diff --git a/tests/unit/java/com/android/server/ConnectivityServiceTest.java b/tests/unit/java/com/android/server/ConnectivityServiceTest.java
index 53cb71c..1652676 100755
--- a/tests/unit/java/com/android/server/ConnectivityServiceTest.java
+++ b/tests/unit/java/com/android/server/ConnectivityServiceTest.java
@@ -4974,9 +4974,6 @@
 
     @Test
     public void testRegisterDefaultNetworkCallback() throws Exception {
-        // NETWORK_SETTINGS is necessary to call registerSystemDefaultNetworkCallback.
-        mServiceContext.setPermission(NETWORK_SETTINGS, PERMISSION_GRANTED);
-
         final TestNetworkCallback defaultNetworkCallback = new TestNetworkCallback();
         mCm.registerDefaultNetworkCallback(defaultNetworkCallback);
         defaultNetworkCallback.assertNoCallback();
@@ -8077,9 +8074,6 @@
 
     @Test
     public void testVpnNetworkActive() throws Exception {
-        // NETWORK_SETTINGS is necessary to call registerSystemDefaultNetworkCallback.
-        mServiceContext.setPermission(NETWORK_SETTINGS, PERMISSION_GRANTED);
-
         final int uid = Process.myUid();
 
         final TestNetworkCallback genericNetworkCallback = new TestNetworkCallback();
@@ -9423,8 +9417,6 @@
     public void testLegacyLockdownVpn() throws Exception {
         mServiceContext.setPermission(
                 Manifest.permission.CONTROL_VPN, PERMISSION_GRANTED);
-        // For LockdownVpnTracker to call registerSystemDefaultNetworkCallback.
-        mServiceContext.setPermission(NETWORK_SETTINGS, PERMISSION_GRANTED);
 
         final NetworkRequest request = new NetworkRequest.Builder().clearCapabilities().build();
         final TestNetworkCallback callback = new TestNetworkCallback();
@@ -12924,8 +12916,6 @@
             throw new IllegalStateException("Default network callbacks already registered");
         }
 
-        // Using Manifest.permission.NETWORK_SETTINGS for registerSystemDefaultNetworkCallback()
-        mServiceContext.setPermission(NETWORK_SETTINGS, PERMISSION_GRANTED);
         mSystemDefaultNetworkCallback = new TestNetworkCallback();
         mDefaultNetworkCallback = new TestNetworkCallback();
         mProfileDefaultNetworkCallback = new TestNetworkCallback();