[ARC] Converts part of ios/web/ui to ARC.

ios/web/webui/url_data_manager_ios_backend.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/url_data_manager_ios_backend.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 18 matching lines @@
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_job.h"
 #include "net/url_request/url_request_job_factory.h"
 #include "url/url_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 using web::WebThread;
 
 namespace web {
 
 namespace {
 
 // TODO(tsepez) remove unsafe-eval when bidichecker_packaged.js fixed.
 const char kChromeURLContentSecurityPolicyHeaderBase[] =
     "Content-Security-Policy: script-src chrome://resources "
     "'self' 'unsafe-eval'; ";
@@ skipping 468 matching lines @@
   // Forward this data on to the pending net::URLRequest, if it exists.
   PendingRequestMap::iterator i = pending_requests_.find(request_id);
   if (i != pending_requests_.end()) {
     URLRequestChromeJob* job(i->second);
     pending_requests_.erase(i);
     job->DataAvailable(bytes);
   }
 }
 
 }  // namespace web