Fix the action bar shows up problem

- Hide the internal action bar.
- Refine the Utils.setupEdgeToEdge API.
- Rollback the testcases.

Bug: 328622648
Fixes: 331308440
Test: atest com.android.settings.UtilsTest SettingsActivityTest
Change-Id: I7dfbc93def3e772b57bf06b8276315cee7402a9c

tests/robotests/src/com/android/settings/SettingsActivityTest.java

@@ -27,7 +27,6 @@ import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
-import android.app.ActionBar;
 import android.app.ActivityManager;
 import android.content.Context;
 import android.content.Intent;
@@ -115,15 +114,6 @@ public class SettingsActivityTest {
         assertThat(((ListenerFragment) fragments.get(1)).mOnActivityResultCalled).isTrue();
     }
 
-    @Test
-    public void getActionBar_hasNoActionBar() {
-        final SettingsActivity activity = Robolectric.buildActivity(SettingsActivity.class).get();
-
-        final ActionBar actionBar = activity.getActionBar();
-
-        assertThat(actionBar).isNull();
-    }
-
     public static class ListenerFragment extends Fragment implements OnActivityResultListener {
 
         private boolean mOnActivityResultCalled;