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

ppapi/proxy/ppb_flash_message_loop_proxy.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 PPAPI_PPB_FLASH_MESSAGE_LOOP_PROXY_H_
 #define PPAPI_PPB_FLASH_MESSAGE_LOOP_PROXY_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 10 matching lines @@
 
 class HostResource;
 
 namespace proxy {
 
 class PPB_Flash_MessageLoop_Proxy
     : public InterfaceProxy,
       public base::SupportsWeakPtr<PPB_Flash_MessageLoop_Proxy> {
  public:
   explicit PPB_Flash_MessageLoop_Proxy(Dispatcher* dispatcher);
-  virtual ~PPB_Flash_MessageLoop_Proxy();
+  ~PPB_Flash_MessageLoop_Proxy() override;
 
   static PP_Resource CreateProxyResource(PP_Instance instance);
 
   // InterfaceProxy implementation.
-  virtual bool OnMessageReceived(const IPC::Message& msg) override;
+  bool OnMessageReceived(const IPC::Message& msg) override;
 
   static const ApiID kApiID = API_ID_PPB_FLASH_MESSAGELOOP;
 
  private:
   void OnMsgCreate(PP_Instance instance, ppapi::HostResource* resource);
   void OnMsgRun(const ppapi::HostResource& flash_message_loop,
                 IPC::Message* reply);
   void OnMsgQuit(const ppapi::HostResource& flash_message_loop);
 
   void WillQuitSoon(scoped_ptr<IPC::Message> reply_message, int32_t result);
 
   DISALLOW_COPY_AND_ASSIGN(PPB_Flash_MessageLoop_Proxy);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PPB_FLASH_MESSAGE_LOOP_PROXY_H_