Use request initiator to check for cross origin requests.

content/browser/service_worker/service_worker_controllee_request_handler.cc

 // 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 "content/browser/service_worker/service_worker_controllee_request_handler.h"
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 434 matching lines @@
   }
   return true;
 }
 
 void ServiceWorkerControlleeRequestHandler::MainResourceLoadFailed() {
   DCHECK(provider_host_);
   // Detach the controller so subresource requests also skip the worker.
   provider_host_->NotifyControllerLost();
 }
 
-GURL ServiceWorkerControlleeRequestHandler::GetRequestingOrigin() {
-  DCHECK(provider_host_);
-  return provider_host_->document_url().GetOrigin();
-}
-
 void ServiceWorkerControlleeRequestHandler::ClearJob() {
   job_.reset();
   was_fetched_via_service_worker_ = false;
   was_fallback_required_ = false;
   original_url_via_service_worker_ = GURL();
   response_type_via_service_worker_ =
       blink::WebServiceWorkerResponseTypeDefault;
 }
 
 }  // namespace content