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

content/public/test/mock_render_thread.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 CONTENT_PUBLIC_TEST_MOCK_RENDER_THREAD_H_
 #define CONTENT_PUBLIC_TEST_MOCK_RENDER_THREAD_H_
 
 #include "base/memory/shared_memory.h"
 #include "base/observer_list.h"
 #include "base/strings/string16.h"
@@ skipping 53 matching lines @@
   void ScheduleIdleHandler(int64 initial_delay_ms) override;
   void IdleHandler() override;
   int64 GetIdleNotificationDelayInMs() const override;
   void SetIdleNotificationDelayInMs(
       int64 idle_notification_delay_in_ms) override;
   void UpdateHistograms(int sequence_number) override;
   int PostTaskToAllWebWorkers(const base::Closure& closure) override;
   bool ResolveProxy(const GURL& url, std::string* proxy_list) override;
   base::WaitableEvent* GetShutdownEvent() override;
 #if defined(OS_WIN)
-  virtual void PreCacheFont(const LOGFONT& log_font) override;
-  virtual void ReleaseCachedFonts() override;
+  void PreCacheFont(const LOGFONT& log_font) override;
+  void ReleaseCachedFonts() override;
 #endif
   ServiceRegistry* GetServiceRegistry() override;
 
   //////////////////////////////////////////////////////////////////////////
   // The following functions are called by the test itself.
 
   void set_routing_id(int32 id) {
     routing_id_ = id;
   }
 
@@ skipping 81 matching lines @@
 
   // Observers to notify.
   ObserverList<RenderProcessObserver> observers_;
 
   cc::TestSharedBitmapManager shared_bitmap_manager_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_MOCK_RENDER_THREAD_H_