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

ppapi/proxy/network_list_resource.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_PROXY_NETWORK_LIST_RESOURCE_H_
 #define PPAPI_PROXY_NETWORK_LIST_RESOURCE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "ppapi/c/private/ppb_net_address_private.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
 #include "ppapi/proxy/serialized_structs.h"
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/thunk/ppb_network_list_api.h"
 
 namespace ppapi {
 namespace proxy {
 
 class NetworkListResource
     : public Resource,
       public thunk::PPB_NetworkList_API {
  public:
   NetworkListResource(PP_Instance instance,
                       const SerializedNetworkList& list);
-  virtual ~NetworkListResource();
+  ~NetworkListResource() override;
 
   // Resource override.
-  virtual thunk::PPB_NetworkList_API* AsPPB_NetworkList_API() override;
+  thunk::PPB_NetworkList_API* AsPPB_NetworkList_API() override;
 
   // PPB_NetworkList_API implementation.
-  virtual uint32_t GetCount() override;
-  virtual PP_Var GetName(uint32_t index) override;
-  virtual PP_NetworkList_Type GetType(uint32_t index) override;
-  virtual PP_NetworkList_State GetState(uint32_t index) override;
-  virtual int32_t GetIpAddresses(uint32_t index,
-                                 const PP_ArrayOutput& output) override;
-  virtual PP_Var GetDisplayName(uint32_t index) override;
-  virtual uint32_t GetMTU(uint32_t index) override;
+  uint32_t GetCount() override;
+  PP_Var GetName(uint32_t index) override;
+  PP_NetworkList_Type GetType(uint32_t index) override;
+  PP_NetworkList_State GetState(uint32_t index) override;
+  int32_t GetIpAddresses(uint32_t index, const PP_ArrayOutput& output) override;
+  PP_Var GetDisplayName(uint32_t index) override;
+  uint32_t GetMTU(uint32_t index) override;
 
  private:
   SerializedNetworkList list_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkListResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_NETWORK_LIST_RESOURCE_H_