Use callback_forward.h instead of callback.h where possible.

chrome_frame/sync_msg_reply_dispatcher.h

 // Copyright (c) 2009 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 CHROME_FRAME_SYNC_MSG_REPLY_DISPATCHER_H_
 #define CHROME_FRAME_SYNC_MSG_REPLY_DISPATCHER_H_
 
 #include <deque>
 
-#include "base/callback.h"
 #include "base/synchronization/lock.h"
 #include "ipc/ipc_channel_proxy.h"
 
 // Base class used to allow synchronous IPC messages to be sent and
 // received in an asynchronous manner. To use this class add it as a filter to
 // your IPC channel using ChannelProxy::AddFilter(). From then on, before
 // sending a synchronous message, call SyncMessageReplyDispatcher::Push() with
 // a callback and a key. This class will then handle the message response and
 // will call the callback when it is received.
 //
@@ skipping 89 matching lines @@
     } else {
       // TODO(stoyan): How to handle errors?
     }
   }
 
   PendingSyncMessageQueue message_queue_;
   base::Lock message_queue_lock_;
 };
 
 #endif  // CHROME_FRAME_SYNC_MSG_REPLY_DISPATCHER_H_