Don't leak render thread on Stop().

media/audio/win/audio_low_latency_output_win.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.
 //
 // Implementation of AudioOutputStream for Windows using Windows Core Audio
 // WASAPI for low latency rendering.
 //
 // Overview of operation and performance:
 //
 // - An object of WASAPIAudioOutputStream is created by the AudioManager
@@ skipping 141 matching lines @@
 #define MEDIA_AUDIO_WIN_AUDIO_LOW_LATENCY_OUTPUT_WIN_H_
 
 #include <Audioclient.h>
 #include <audiopolicy.h>
 #include <MMDeviceAPI.h>
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/simple_thread.h"
 #include "base/win/scoped_co_mem.h"
 #include "base/win/scoped_com_initializer.h"
 #include "base/win/scoped_comptr.h"
 #include "base/win/scoped_handle.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/media_export.h"
 
@@ skipping 129 matching lines @@
   base::win::ScopedCOMInitializer com_init_;
 
   // Contains the thread ID of the creating thread.
   base::PlatformThreadId creating_thread_id_;
 
   // Our creator, the audio manager needs to be notified when we close.
   AudioManagerWin* manager_;
 
   // Rendering is driven by this thread (which has no message loop).
   // All OnMoreData() callbacks will be called from this thread.
-  base::DelegateSimpleThread* render_thread_;
+  scoped_ptr<base::DelegateSimpleThread> render_thread_;
 
   // Contains the desired audio format which is set up at construction.
   // Extended PCM waveform format structure based on WAVEFORMATEXTENSIBLE.
   // Use this for multiple channel and hi-resolution PCM data.
   WAVEFORMATPCMEX format_;
 
   // Copy of the audio format which we know the audio engine supports.
   // It is recommended to ensure that the sample rate in |format_| is identical
   // to the sample rate in |audio_engine_mix_format_|.
   base::win::ScopedCoMem<WAVEFORMATPCMEX> audio_engine_mix_format_;
@@ skipping 69 matching lines @@
 
   // This event will be signaled when stream switching shall take place.
   base::win::ScopedHandle stream_switch_event_;
 
   DISALLOW_COPY_AND_ASSIGN(WASAPIAudioOutputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_WIN_AUDIO_LOW_LATENCY_OUTPUT_WIN_H_