Update {virtual,override} to follow C++11 style in chrome.

chrome/browser/ui/metro_pin_tab_helper_win.h

 // Copyright (c) 2012 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_UI_METRO_PIN_TAB_HELPER_WIN_H_
 #define CHROME_BROWSER_UI_METRO_PIN_TAB_HELPER_WIN_H_
 
 #include <vector>
 
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 #include "content/public/common/favicon_url.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/image/image_skia.h"
 
 namespace gfx {
 class Size;
 }
 
 // Per-tab class to help manage metro pinning.
 class MetroPinTabHelper
     : public content::WebContentsObserver,
       public content::WebContentsUserData<MetroPinTabHelper> {
  public:
-  virtual ~MetroPinTabHelper();
+  ~MetroPinTabHelper() override;
 
   bool IsPinned() const;
 
   void TogglePinnedToStartScreen();
 
   // content::WebContentsObserver overrides:
-  virtual void DidNavigateMainFrame(
+  void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) override;
-  virtual void DidUpdateFaviconURL(
+  void DidUpdateFaviconURL(
       const std::vector<content::FaviconURL>& candidates) override;
 
  private:
   // The FaviconDownloader class handles downloading the favicons when a page
   // is being pinned. After it has downloaded any available favicons it will
   // continue on with the page pinning action.
   class FaviconChooser;
 
   explicit MetroPinTabHelper(content::WebContents* web_contents);
   friend class content::WebContentsUserData<MetroPinTabHelper>;
@@ skipping 14 matching lines @@
   std::vector<content::FaviconURL> favicon_url_candidates_;
 
   // The currently active FaviconChooser, if there is one.
   scoped_ptr<FaviconChooser> favicon_chooser_;
 
 
   DISALLOW_COPY_AND_ASSIGN(MetroPinTabHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_METRO_PIN_TAB_HELPER_WIN_H_