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

content/browser/frame_host/interstitial_page_impl.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_BROWSER_FRAME_HOST_INTERSTITIAL_PAGE_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_INTERSTITIAL_PAGE_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 127 matching lines @@
       SiteInstance* instance) override;
 
   FrameTree* GetFrameTree() override;
 
   // RenderWidgetHostDelegate implementation:
   void RenderWidgetDeleted(RenderWidgetHostImpl* render_widget_host) override;
   bool PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
                               bool* is_keyboard_shortcut) override;
   void HandleKeyboardEvent(const NativeWebKeyboardEvent& event) override;
 #if defined(OS_WIN)
-  virtual gfx::NativeViewAccessible GetParentNativeViewAccessible() override;
+  gfx::NativeViewAccessible GetParentNativeViewAccessible() override;
 #endif
 
   bool enabled() const { return enabled_; }
   WebContents* web_contents() const;
   const GURL& url() const { return url_; }
 
   // Creates the WebContentsView that shows the interstitial RVH.
   // Overriden in unit tests.
   virtual WebContentsView* CreateWebContentsView();
 
@@ skipping 128 matching lines @@
   scoped_refptr<SessionStorageNamespace> session_storage_namespace_;
 
   base::WeakPtrFactory<InterstitialPageImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InterstitialPageImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_INTERSTITIAL_PAGE_IMPL_H_