Add OVERRIDE to content/.

content/renderer/gpu/gpu_channel_host.h

Index: content/renderer/gpu/gpu_channel_host.h
diff --git a/content/renderer/gpu/gpu_channel_host.h b/content/renderer/gpu/gpu_channel_host.h
index 0319dacd4a055edfbad6cda4a496045f5a80bc4d..d42a152e69a48488d153c47e085989144b60c3c9 100644
--- a/content/renderer/gpu/gpu_channel_host.h
+++ b/content/renderer/gpu/gpu_channel_host.h
@@ -72,7 +72,7 @@ class GpuChannelHost : public IPC::Message::Sender,
   void OnChannelError();
 
   // IPC::Message::Sender implementation:
-  virtual bool Send(IPC::Message* msg);
+  virtual bool Send(IPC::Message* msg) OVERRIDE;
 
   // Create and connect to a command buffer in the GPU process.
   CommandBufferProxy* CreateViewCommandBuffer(
@@ -158,8 +158,8 @@ class GpuChannelHost : public IPC::Message::Sender,
     void RemoveRoute(int route_id);
 
     // IPC::ChannelProxy::MessageFilter implementation:
-    virtual bool OnMessageReceived(const IPC::Message& msg);
-    virtual void OnChannelError();
+    virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
+    virtual void OnChannelError() OVERRIDE;
 
    private:
     GpuChannelHost* parent_;