Refactor the URLResponseInfo to use new design

ppapi/shared_impl/url_response_info_data.cc

 // 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.
 
-#include "ppapi/proxy/mock_resource.h"
+#include "ppapi/shared_impl/url_response_info_data.h"
 
 namespace ppapi {
-namespace proxy {
 
-MockResource::MockResource(const HostResource& resource)
-    : Resource(OBJECT_IS_PROXY, resource) {
+URLResponseInfoData::URLResponseInfoData() : status_code(-1) {
 }
 
-MockResource::~MockResource() {
+URLResponseInfoData::~URLResponseInfoData() {
 }
 
-}  // namespace proxy
 }  // namespace ppapi