Update {virtual,override,final} to follow C++11 style.

android_webview/native/external_video_surface_container_impl.h

Index: android_webview/native/external_video_surface_container_impl.h
diff --git a/android_webview/native/external_video_surface_container_impl.h b/android_webview/native/external_video_surface_container_impl.h
index ff741d82db180726ced517ce387964876b5b4fdd..29e7889e44db54f6ee5d69737b1a47db2297cb41 100644
--- a/android_webview/native/external_video_surface_container_impl.h
+++ b/android_webview/native/external_video_surface_container_impl.h
@@ -23,15 +23,15 @@ 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 player_id, const gfx::RectF& rect) override;
+  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.
   void SurfaceCreated(
@@ -39,7 +39,7 @@ class ExternalVideoSurfaceContainerImpl
   void SurfaceDestroyed(JNIEnv* env, jobject obj, jint player_id);
 
  private:
-  virtual ~ExternalVideoSurfaceContainerImpl();
+  ~ExternalVideoSurfaceContainerImpl() override;
 
   base::android::ScopedJavaGlobalRef<jobject> jobject_;