Revert of [Android] Stop hiding the RWHV layer subtree when hiding the widget

ui/android/window_android.h

Index: ui/android/window_android.h
diff --git a/ui/android/window_android.h b/ui/android/window_android.h
index 005f4d67cc1d2a829fafcbeb16633b92e2b90782..f464a11bdfbedc9c4bdcc8f9828fc84a92ec1c8c 100644
--- a/ui/android/window_android.h
+++ b/ui/android/window_android.h
@@ -43,7 +43,6 @@
 
   // Compositor callback relay.
   void OnCompositingDidCommit();
-  void OnVisibilityChanged(bool visible);
 
   void AttachCompositor(WindowAndroidCompositor* compositor);
   void DetachCompositor();
@@ -60,8 +59,6 @@
                jlong time_micros,
                jlong period_micros);
   void Animate(base::TimeTicks begin_frame_time);
-  void OnActivityPaused(JNIEnv* env, jobject obj);
-  void OnActivityResumed(JNIEnv* env, jobject obj);
 
  private:
   ~WindowAndroid();