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

ppapi/proxy/url_request_info_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_URL_REQUEST_INFO_RESOURCE_H_
 #define PPAPI_PROXY_URL_REQUEST_INFO_RESOURCE_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
 #include "ppapi/shared_impl/url_request_info_data.h"
 #include "ppapi/thunk/ppb_url_request_info_api.h"
 
 namespace ppapi {
 namespace proxy {
 
 class PPAPI_PROXY_EXPORT URLRequestInfoResource
     : public PluginResource,
       public thunk::PPB_URLRequestInfo_API {
  public:
   URLRequestInfoResource(Connection connection, PP_Instance instance,
                          const URLRequestInfoData& data);
-  virtual ~URLRequestInfoResource();
+  ~URLRequestInfoResource() override;
 
   // Resource overrides.
-  virtual thunk::PPB_URLRequestInfo_API* AsPPB_URLRequestInfo_API() override;
+  thunk::PPB_URLRequestInfo_API* AsPPB_URLRequestInfo_API() override;
 
   // PPB_URLRequestInfo_API implementation.
-  virtual PP_Bool SetProperty(PP_URLRequestProperty property,
-                              PP_Var var) override;
-  virtual PP_Bool AppendDataToBody(const void* data, uint32_t len) override;
-  virtual PP_Bool AppendFileToBody(
+  PP_Bool SetProperty(PP_URLRequestProperty property, PP_Var var) override;
+  PP_Bool AppendDataToBody(const void* data, uint32_t len) override;
+  PP_Bool AppendFileToBody(
       PP_Resource file_ref,
       int64_t start_offset,
       int64_t number_of_bytes,
       PP_Time expected_last_modified_time) override;
-  virtual const URLRequestInfoData& GetData() const override;
+  const URLRequestInfoData& GetData() const override;
 
   bool SetUndefinedProperty(PP_URLRequestProperty property);
   bool SetBooleanProperty(PP_URLRequestProperty property, bool value);
   bool SetIntegerProperty(PP_URLRequestProperty property, int32_t value);
   bool SetStringProperty(PP_URLRequestProperty property,
                          const std::string& value);
 
  private:
   URLRequestInfoData data_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestInfoResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_URL_REQUEST_INFO_RESOURCE_H_