Use request initiator to check for cross origin requests.

content/browser/service_worker/foreign_fetch_request_handler.h

 // Copyright 2015 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.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_FOREIGN_FETCH_REQUEST_HANDLER_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_FOREIGN_FETCH_REQUEST_HANDLER_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/supports_user_data.h"
@@ skipping 91 matching lines @@
                           base::TimeTicks service_worker_ready_time) override;
   void OnStartCompleted(
       bool was_fetched_via_service_worker,
       bool was_fallback_required,
       const GURL& original_url_via_service_worker,
       blink::WebServiceWorkerResponseType response_type_via_service_worker,
       base::TimeTicks worker_start_time,
       base::TimeTicks service_worker_ready_time) override;
   ServiceWorkerVersion* GetServiceWorkerVersion(
       ServiceWorkerMetrics::URLRequestJobResult* result) override;
-  GURL GetRequestingOrigin() override;
 
   // Sets |job_| to nullptr, and clears all extra response info associated with
   // that job.
   void ClearJob();
 
   scoped_refptr<ServiceWorkerContextWrapper> context_;
   base::WeakPtr<storage::BlobStorageContext> blob_storage_context_;
   ResourceType resource_type_;
   FetchRequestMode request_mode_;
   FetchCredentialsMode credentials_mode_;
@@ skipping 10 matching lines @@
   bool use_network_ = false;
 
   base::WeakPtrFactory<ForeignFetchRequestHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ForeignFetchRequestHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_FOREIGN_FETCH_REQUEST_HANDLER_H_