Add OVERRIDE to content/.

content/renderer/media/video_capture_message_filter.h

Index: content/renderer/media/video_capture_message_filter.h
diff --git a/content/renderer/media/video_capture_message_filter.h b/content/renderer/media/video_capture_message_filter.h
index 6c67f8e6398ea78b6b45fe05e79ad06bebaf2453..b23ddc8e12fb9378b29cf62e9616f475f2521273 100644
--- a/content/renderer/media/video_capture_message_filter.h
+++ b/content/renderer/media/video_capture_message_filter.h
@@ -66,10 +66,10 @@ class CONTENT_EXPORT VideoCaptureMessageFilter
   typedef std::map<int32, Delegate*> Delegates;
 
   // IPC::ChannelProxy::MessageFilter override. Called on IO thread.
-  virtual bool OnMessageReceived(const IPC::Message& message);
-  virtual void OnFilterAdded(IPC::Channel* channel);
-  virtual void OnFilterRemoved();
-  virtual void OnChannelClosing();
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
+  virtual void OnFilterRemoved() OVERRIDE;
+  virtual void OnChannelClosing() OVERRIDE;
 
   // Receive a newly created buffer from browser process.
   void OnBufferCreated(int device_id,