Clean up redundant virtual specifiers for chromecast android

chromecast/browser/android/external_video_surface_container_impl.h

Index: chromecast/browser/android/external_video_surface_container_impl.h
diff --git a/chromecast/browser/android/external_video_surface_container_impl.h b/chromecast/browser/android/external_video_surface_container_impl.h
index d87debfaa8abbb14b8f21bfe2d984d5f4fd664c0..434071dbbfe8a72faf7977397513a5feac0dd085 100644
--- a/chromecast/browser/android/external_video_surface_container_impl.h
+++ b/chromecast/browser/android/external_video_surface_container_impl.h
@@ -24,14 +24,14 @@ class ExternalVideoSurfaceContainerImpl
   ExternalVideoSurfaceContainerImpl(content::WebContents* contents);
 
   // ExternalVideoSurfaceContainer implementation.
-  virtual void RequestExternalVideoSurface(
+  void RequestExternalVideoSurface(
       int player_id,
       const SurfaceCreatedCB& surface_created_cb,
       const SurfaceDestroyedCB& surface_destroyed_cb) override;
-  virtual int GetCurrentPlayerId() override;
-  virtual void ReleaseExternalVideoSurface(int player_id) override;
-  virtual void OnFrameInfoUpdated() override;
-  virtual void OnExternalVideoSurfacePositionChanged(
+  int GetCurrentPlayerId() override;
+  void ReleaseExternalVideoSurface(int player_id) override;
+  void OnFrameInfoUpdated() override;
+  void OnExternalVideoSurfacePositionChanged(
       int player_id, const gfx::RectF& rect) override;
 
   // Methods called from Java.
@@ -40,7 +40,7 @@ class ExternalVideoSurfaceContainerImpl
   void SurfaceDestroyed(JNIEnv* env, jobject obj, jint player_id);
 
  private:
-  virtual ~ExternalVideoSurfaceContainerImpl();
+  ~ExternalVideoSurfaceContainerImpl() override;
 
   base::android::ScopedJavaGlobalRef<jobject> jobject_;