Standardize usage of virtual/override/final in content/

content/public/renderer/render_frame.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_RENDERER_RENDER_FRAME_H_
 #define CONTENT_PUBLIC_RENDERER_RENDER_FRAME_H_
 
 #include "base/strings/string16.h"
 #include "content/common/content_export.h"
 #include "ipc/ipc_listener.h"
@@ skipping 102 matching lines @@
   virtual void SetSelectedText(const base::string16& selection_text,
                                size_t offset,
                                const gfx::Range& range) = 0;
 
   // Ensures that builtin mojo bindings modules are available in |context|.
   virtual void EnsureMojoBuiltinsAreAvailable(
       v8::Isolate* isolate,
       v8::Handle<v8::Context> context) = 0;
 
  protected:
-  virtual ~RenderFrame() {}
+  ~RenderFrame() override {}
 
  private:
   // This interface should only be implemented inside content.
   friend class RenderFrameImpl;
   RenderFrame() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_RENDER_FRAME_H_