Standardize usage of virtual/override/final in content/renderer/

content/renderer/render_frame_proxy.h

Index: content/renderer/render_frame_proxy.h
diff --git a/content/renderer/render_frame_proxy.h b/content/renderer/render_frame_proxy.h
index 409d74e7e8bddf9abbb967deac408617657cb017..2afd45383e3138bae59fa209dda2b2acd06eeed1 100644
--- a/content/renderer/render_frame_proxy.h
+++ b/content/renderer/render_frame_proxy.h
@@ -84,10 +84,10 @@ class CONTENT_EXPORT RenderFrameProxy
   // Returns the RenderFrameProxy given a WebFrame.
   static RenderFrameProxy* FromWebFrame(blink::WebFrame* web_frame);
 
-  virtual ~RenderFrameProxy();
+  ~RenderFrameProxy() override;
 
   // IPC::Sender
-  virtual bool Send(IPC::Message* msg) override;
+  bool Send(IPC::Message* msg) override;
 
   // Out-of-process child frames receive a signal from RenderWidgetCompositor
   // when a compositor frame has committed.
@@ -117,7 +117,7 @@ class CONTENT_EXPORT RenderFrameProxy
   void Init(blink::WebRemoteFrame* frame, RenderViewImpl* render_view);
 
   // IPC::Listener
-  virtual bool OnMessageReceived(const IPC::Message& msg) override;
+  bool OnMessageReceived(const IPC::Message& msg) override;
 
   // IPC handlers
   void OnDeleteProxy();