FBTF: Remove unneeded headers from base/ (part 2)

chrome/renderer/media/audio_renderer_impl.h

 // Copyright (c) 2010 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 24 matching lines @@
 //    Responsible for decoding audio data and gives raw PCM data to this object.
 
 #ifndef CHROME_RENDERER_MEDIA_AUDIO_RENDERER_IMPL_H_
 #define CHROME_RENDERER_MEDIA_AUDIO_RENDERER_IMPL_H_
 #pragma once
 
 #include "base/gtest_prod_util.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_io.h"
 #include "media/base/factory.h"
 #include "media/base/filters.h"
 #include "media/filters/audio_renderer_base.h"
 
 class AudioMessageFilter;
 
 class AudioRendererImpl : public media::AudioRendererBase,
                           public AudioMessageFilter::Delegate,
@@ skipping 111 matching lines @@
   // State variables for prerolling.
   bool prerolling_;
 
   // Remaining bytes for prerolling to complete.
   uint32 preroll_bytes_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererImpl);
 };
 
 #endif  // CHROME_RENDERER_MEDIA_AUDIO_RENDERER_IMPL_H_