[ARC] [Split this CL] Convert ios/web/webui to ARC.

ios/web/webui/web_ui_ios_data_source_impl.mm

 // Copyright 2014 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 "ios/web/webui/web_ui_ios_data_source_impl.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/string_util.h"
 #include "ios/web/public/web_client.h"
 #include "ui/base/webui/jstemplate_builder.h"
 #include "ui/base/webui/web_ui_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace web {
 
 // static
 WebUIIOSDataSource* WebUIIOSDataSource::Create(const std::string& source_name) {
   return new WebUIIOSDataSourceImpl(source_name);
 }
 
 // static
 void WebUIIOSDataSource::Add(BrowserState* browser_state,
                              WebUIIOSDataSource* source) {
@@ skipping 127 matching lines @@
 
 void WebUIIOSDataSourceImpl::SendFromResourceBundle(
     const URLDataSourceIOS::GotDataCallback& callback,
     int idr) {
   scoped_refptr<base::RefCountedMemory> response(
       GetWebClient()->GetDataResourceBytes(idr));
   callback.Run(response);
 }
 
 }  // namespace web