Reduce header dependencies in base/

chrome/renderer/media/audio_renderer_impl.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.
 //
 // Audio rendering unit utilizing audio output stream provided by browser
 // process through IPC.
 //
 // Relationship of classes.
 //
 //    AudioRendererHost                AudioRendererImpl
@@ skipping 73 matching lines @@
 //       Called from AudioRendererBase for stop event.
 //
 // Audio decoder thread (If there's one.)
 // \-- OnReadComplete()
 //       A raw PCM audio packet buffer is received here, this method is called
 //       from pipeline thread if audio decoder thread does not exist.
 
 #ifndef CHROME_RENDERER_MEDIA_AUDIO_RENDERER_IMPL_H_
 #define CHROME_RENDERER_MEDIA_AUDIO_RENDERER_IMPL_H_
 
+#include "base/scoped_ptr.h"
 #include "base/lock.h"
 #include "base/shared_memory.h"
 #include "base/waitable_event.h"
 #include "chrome/renderer/audio_message_filter.h"
 #include "media/audio/audio_output.h"
 #include "media/base/factory.h"
 #include "media/base/filters.h"
 #include "media/filters/audio_renderer_base.h"
 
 class AudioMessageFilter;
@@ skipping 64 matching lines @@
 
   Lock lock_;
   bool stopped_;
   float playback_rate_;
   base::WaitableEvent packet_request_event_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererImpl);
 };
 
 #endif  // CHROME_RENDERER_MEDIA_AUDIO_RENDERER_IMPL_H_