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

ppapi/proxy/url_request_info_resource.h

Index: ppapi/proxy/url_request_info_resource.h
diff --git a/ppapi/proxy/url_request_info_resource.h b/ppapi/proxy/url_request_info_resource.h
index 8b07c7a3eb9cc6aaf7ffe78a962ed2203b6163bc..318668fb0a2e948e68079945f9317ac4fdd811b6 100644
--- a/ppapi/proxy/url_request_info_resource.h
+++ b/ppapi/proxy/url_request_info_resource.h
@@ -21,21 +21,20 @@ class PPAPI_PROXY_EXPORT URLRequestInfoResource
  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);