Get rid of ipc_sender.h include in ipc_message.h.

chrome/browser/importer/external_process_importer_bridge.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 CHROME_BROWSER_IMPORTER_EXTERNAL_PROCESS_IMPORTER_BRIDGE_H_
 #define CHROME_BROWSER_IMPORTER_EXTERNAL_PROCESS_IMPORTER_BRIDGE_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/importer/importer_bridge.h"
 #include "chrome/browser/importer/profile_writer.h"
-#include "ipc/ipc_message.h"
 
 class GURL;
 
 namespace base {
 class DictionaryValue;
 class TaskRunner;
 }
 
+namespace IPC {
+class Message;
+class Sender;
+}
+
 // When the importer is run in an external process, the bridge is effectively
 // split in half by the IPC infrastructure.  The external bridge receives data
 // and notifications from the importer, and sends it across IPC.  The
 // internal bridge gathers the data from the IPC host and writes it to the
 // profile.
 class ExternalProcessImporterBridge : public ImporterBridge {
  public:
   ExternalProcessImporterBridge(
       const base::DictionaryValue& localized_strings,
       IPC::Sender* sender,
@@ skipping 41 matching lines @@
   // bundle isn't available to the external process.
   scoped_ptr<base::DictionaryValue> localized_strings_;
 
   IPC::Sender* sender_;
   scoped_refptr<base::TaskRunner> task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalProcessImporterBridge);
 };
 
 #endif  // CHROME_BROWSER_IMPORTER_EXTERNAL_PROCESS_IMPORTER_BRIDGE_H_