Introduce ResourceRequesterInfo to abstract the requester of resource request

content/browser/service_worker/link_header_support.h

 // Copyright 2016 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_LINK_HEADER_SUPPORT_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_LINK_HEADER_SUPPORT_H_
 
 #include <string>
 #include <unordered_map>
 #include <vector>
 
 #include "base/macros.h"
 #include "content/common/content_export.h"
 
 namespace net {
 class URLRequest;
 }
 
 namespace content {
 class ServiceWorkerContextWrapper;
 
-void ProcessRequestForLinkHeaders(const net::URLRequest* request);
+void ProcessRequestForLinkHeaders(net::URLRequest* request);
 
 CONTENT_EXPORT void ProcessLinkHeaderForRequest(
-    const net::URLRequest* request,
+    net::URLRequest* request,
     const std::string& link_header,
     ServiceWorkerContextWrapper* service_worker_context_for_testing = nullptr);
 
 CONTENT_EXPORT void SplitLinkHeaderForTesting(const std::string& header,
                                               std::vector<std::string>* values);
 CONTENT_EXPORT bool ParseLinkHeaderValueForTesting(
     const std::string& link,
     std::string* url,
     std::unordered_map<std::string, std::string>* params);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_LINK_HEADER_SUPPORT_H_