Add the "virtual" keyword on method overrides that are missing it.

chrome/browser/dom_ui/options/options_ui.h

 // Copyright (c) 2010 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 CHROME_BROWSER_DOM_UI_OPTIONS_OPTIONS_UI_H_
 #define CHROME_BROWSER_DOM_UI_OPTIONS_OPTIONS_UI_H_
 #pragma once
 
 #include <string>
 
@@ skipping 63 matching lines @@
  private:
   DISALLOW_COPY_AND_ASSIGN(OptionsPageUIHandler);
 };
 
 class OptionsUI : public DOMUI {
  public:
   explicit OptionsUI(TabContents* contents);
   virtual ~OptionsUI();
 
   static RefCountedMemory* GetFaviconResourceBytes();
-  void RenderViewCreated(RenderViewHost* render_view_host);
-  void DidBecomeActiveForReusedRenderView();
+  virtual void RenderViewCreated(RenderViewHost* render_view_host);
+  virtual void DidBecomeActiveForReusedRenderView();
 
   void InitializeHandlers();
 
  private:
   // Adds OptionsPageUiHandler to the handlers list if handler is enabled.
   void AddOptionsPageUIHandler(DictionaryValue* localized_strings,
                                OptionsPageUIHandler* handler);
 
   DISALLOW_COPY_AND_ASSIGN(OptionsUI);
 };
 
 #endif  // CHROME_BROWSER_DOM_UI_OPTIONS_OPTIONS_UI_H_