Make SyncLoad result handling pluggable

content/browser/loader/sync_resource_handler.h

 // Copyright (c) 2012 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_SYNC_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_LOADER_SYNC_RESOURCE_HANDLER_H_
 
 #include <stdint.h>
 
 #include <string>
 
+#include "content/browser/loader/resource_dispatcher_host_impl.h"
 #include "content/browser/loader/resource_handler.h"
 #include "content/public/common/resource_response.h"
 
 namespace IPC {
 class Message;
 }
 
 namespace net {
 class IOBuffer;
 class URLRequest;
 }
 
 namespace content {
 class ResourceContext;
-class ResourceDispatcherHostImpl;
 class ResourceMessageFilter;
 
 // Used to complete a synchronous resource request in response to resource load
 // events from the resource dispatcher host.
 class SyncResourceHandler : public ResourceHandler {
  public:
+  using SyncLoadResultCallback =
+      ResourceDispatcherHostImpl::SyncLoadResultCallback;
+
   SyncResourceHandler(net::URLRequest* request,
-                      IPC::Message* result_message,
+                      const SyncLoadResultCallback& sync_result_handler,
                       ResourceDispatcherHostImpl* resource_dispatcher_host);
   ~SyncResourceHandler() override;
 
   bool OnRequestRedirected(const net::RedirectInfo& redirect_info,
                            ResourceResponse* response,
                            bool* defer) override;
   bool OnResponseStarted(ResourceResponse* response, bool* defer) override;
   bool OnWillStart(const GURL& url, bool* defer) override;
   bool OnWillRead(scoped_refptr<net::IOBuffer>* buf,
                   int* buf_size,
                   int min_size) override;
   bool OnReadCompleted(int bytes_read, bool* defer) override;
   void OnResponseCompleted(const net::URLRequestStatus& status,
                            bool* defer) override;
   void OnDataDownloaded(int bytes_downloaded) override;
 
  private:
   enum { kReadBufSize = 3840 };
 
   scoped_refptr<net::IOBuffer> read_buffer_;
 
   SyncLoadResult result_;
-  IPC::Message* result_message_;
+  SyncLoadResultCallback result_handler_;
   ResourceDispatcherHostImpl* rdh_;
   int64_t total_transfer_size_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_SYNC_RESOURCE_HANDLER_H_