Replace init_cb in Renderer::Initialize() with base::Closure.

media/base/pipeline.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 MEDIA_BASE_PIPELINE_H_
 #define MEDIA_BASE_PIPELINE_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/lock.h"
@@ skipping 242 matching lines @@
   // Carries out removing a text stream from the text renderer.
   void RemoveTextStreamTask(DemuxerStream* text_stream);
 
   // Callbacks executed when a text track is added.
   void OnAddTextTrack(const TextTrackConfig& config,
                       const AddTextTrackDoneCB& done_cb);
 
   // Kicks off initialization for each media object, executing |done_cb| with
   // the result when completed.
   void InitializeDemuxer(const PipelineStatusCB& done_cb);
-  void InitializeRenderer(const PipelineStatusCB& done_cb);
+  void InitializeRenderer(const base::Closure& done_cb);
 
   void OnStateTransition(PipelineStatus status);
   void StateTransitionTask(PipelineStatus status);
 
   // Initiates an asynchronous pause-flush-seek-preroll call sequence
   // executing |done_cb| with the final status when completed.
   void DoSeek(base::TimeDelta seek_timestamp, const PipelineStatusCB& done_cb);
 
   // Initiates an asynchronous pause-flush-stop call sequence executing
   // |done_cb| when completed.
@@ skipping 87 matching lines @@
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<Pipeline> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Pipeline);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_H_