Add OVERRIDE to content/.

content/public/renderer/render_view_observer.h

Index: content/public/renderer/render_view_observer.h
diff --git a/content/public/renderer/render_view_observer.h b/content/public/renderer/render_view_observer.h
index 9e81c2d863d1b1b3616affca2ca247a26909c013..471ce149ba4b3d744fc0aab3b887dacf9fe2d238 100644
--- a/content/public/renderer/render_view_observer.h
+++ b/content/public/renderer/render_view_observer.h
@@ -79,7 +79,7 @@ class CONTENT_EXPORT RenderViewObserver : public IPC::Channel::Listener,
   virtual void ClosePage() {}
 
   // IPC::Channel::Listener implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message);
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // This is called by the RenderView when it's going away so that this object
   // can null out its pointer.
@@ -90,7 +90,7 @@ class CONTENT_EXPORT RenderViewObserver : public IPC::Channel::Listener,
   virtual ~RenderViewObserver();
 
   // IPC::Message::Sender implementation.
-  virtual bool Send(IPC::Message* message);
+  virtual bool Send(IPC::Message* message) OVERRIDE;
 
   RenderView* render_view();
   int routing_id() { return routing_id_; }