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

ppapi/proxy/network_monitor_resource.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 PPAPI_PROXY_NETWORK_MONITOR_RESOURCE_H_
 #define PPAPI_PROXY_NETWORK_MONITOR_RESOURCE_H_
 
 #include <list>
 
 #include "ppapi/proxy/network_list_resource.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/shared_impl/scoped_pp_resource.h"
 #include "ppapi/thunk/ppb_network_monitor_api.h"
 
 namespace base {
 class MessageLoopProxy;
 }  // namespace base
 
 namespace ppapi {
 namespace proxy {
 
 class NetworkMonitorResource : public PluginResource,
                                public thunk::PPB_NetworkMonitor_API {
  public:
   explicit NetworkMonitorResource(Connection connection,
                                   PP_Instance instance);
-  virtual ~NetworkMonitorResource();
+  ~NetworkMonitorResource() override;
 
   // PluginResource overrides.
   ppapi::thunk::PPB_NetworkMonitor_API* AsPPB_NetworkMonitor_API() override;
-  virtual void OnReplyReceived(const ResourceMessageReplyParams& params,
-                               const IPC::Message& msg) override;
+  void OnReplyReceived(const ResourceMessageReplyParams& params,
+                       const IPC::Message& msg) override;
 
   // thunk::PPB_NetworkMonitor_API interface
-  virtual int32_t UpdateNetworkList(
+  int32_t UpdateNetworkList(
       PP_Resource* network_list,
       scoped_refptr<TrackedCallback> callback) override;
 
  private:
   // IPC message handlers for the messages received from the browser.
   void OnPluginMsgNetworkList(const ResourceMessageReplyParams& params,
                               const SerializedNetworkList& list);
   void OnPluginMsgForbidden(const ResourceMessageReplyParams& params);
 
   ScopedPPResource current_list_;
   bool forbidden_;
 
   // Parameters passed to UpdateNetworkList().
   PP_Resource* network_list_;
   scoped_refptr<TrackedCallback> update_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkMonitorResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_NETWORK_MONITOR_RESOURCE_H_