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

ppapi/proxy/url_response_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_RESPONSE_INFO_RESOURCE_H_
 #define PPAPI_PROXY_URL_RESPONSE_INFO_RESOURCE_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ppapi/proxy/plugin_resource.h"
@@ skipping 10 matching lines @@
       public NON_EXPORTED_BASE(thunk::PPB_URLResponseInfo_API) {
  public:
   // The file_ref_resource should be the body_as_file_ref host resource in the
   // |data| converted to a resource valid in the current process (if we're
   // downloading to a file; it will be 0 if we're not). A reference
   // is passed from the caller and is taken over by this object.
   URLResponseInfoResource(Connection connection,
                           PP_Instance instance,
                           const URLResponseInfoData& data,
                           PP_Resource file_ref_resource);
-  virtual ~URLResponseInfoResource();
+  ~URLResponseInfoResource() override;
 
   // Resource override.
-  virtual PPB_URLResponseInfo_API* AsPPB_URLResponseInfo_API() override;
+  PPB_URLResponseInfo_API* AsPPB_URLResponseInfo_API() override;
 
   // PPB_URLResponseInfo_API implementation.
-  virtual PP_Var GetProperty(PP_URLResponseProperty property) override;
-  virtual PP_Resource GetBodyAsFileRef() override;
+  PP_Var GetProperty(PP_URLResponseProperty property) override;
+  PP_Resource GetBodyAsFileRef() override;
 
   const URLResponseInfoData& data() const { return data_; }
 
  private:
   URLResponseInfoData data_;
 
   // Non-zero when the load is being streamed to a file.
   ScopedPPResource body_as_file_ref_;
 
   DISALLOW_COPY_AND_ASSIGN(URLResponseInfoResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_URL_RESPONSE_INFO_RESOURCE_H_