Introduce ResourceRequesterInfo to abstract the requester of resource request

content/browser/loader/async_revalidation_manager.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_LOADER_ASYNC_REVALIDATION_MANAGER_H_
 #define CONTENT_BROWSER_LOADER_ASYNC_REVALIDATION_MANAGER_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 19 matching lines @@
 // ResourceDispatcherHostImpl. It also implements the creation of a new
 // net::URLRequest and AsyncRevalidationDriver from an existing net::URLRequest
 // that has had the stale-while-revalidate algorithm applied to it.
 class AsyncRevalidationManager {
  public:
   AsyncRevalidationManager();
   ~AsyncRevalidationManager();
 
   // Starts an async revalidation by copying |for_request|. |scheduler| must
   // remain valid until this object is destroyed.
-  void BeginAsyncRevalidation(const net::URLRequest& for_request,
+  void BeginAsyncRevalidation(net::URLRequest* for_request,
                               ResourceScheduler* scheduler);
 
   // Cancel all pending async revalidations that use ResourceContext.
   void CancelAsyncRevalidationsForResourceContext(
       ResourceContext* resource_context);
 
   static bool QualifiesForAsyncRevalidation(const ResourceRequest& request);
 
  private:
   // The key of the map of pending async revalidations. This key has a distinct
@@ skipping 47 matching lines @@
   // Map of AsyncRevalidationDriver instances that are currently in-flight:
   // either waiting to be scheduled or active on the network.
   AsyncRevalidationMap in_progress_;
 
   DISALLOW_COPY_AND_ASSIGN(AsyncRevalidationManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_ASYNC_REVALIDATION_MANAGER_H_