content: Cleanup class/struct forward declarations

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 {
 
 // Used to complete a synchronous resource request in response to resource load
 // events from the resource dispatcher host.
 class SyncResourceHandler : public ResourceHandler {
@@ skipping 26 matching lines @@
 
   SyncLoadResult result_;
   SyncLoadResultCallback result_handler_;
   ResourceDispatcherHostImpl* rdh_;
   int64_t total_transfer_size_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_SYNC_RESOURCE_HANDLER_H_