Move audio output number limit to AudioManager.

media/audio/win/audio_manager_win.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.
 
 #ifndef MEDIA_AUDIO_AUDIO_MANAGER_WIN_H_
 #define MEDIA_AUDIO_AUDIO_MANAGER_WIN_H_
 
 #include <windows.h>
 
 #include "base/basictypes.h"
 #include "media/audio/audio_manager_base.h"
 
 class PCMWaveInAudioInputStream;
 class PCMWaveOutAudioOutputStream;
 
 // Windows implementation of the AudioManager singleton. This class is internal
 // to the audio output and only internal users can call methods not exposed by
 // the AudioManager class.
 class AudioManagerWin : public AudioManagerBase {
  public:
-  AudioManagerWin() {}
+  AudioManagerWin();
   // Implementation of AudioManager.
   virtual bool HasAudioOutputDevices();
   virtual bool HasAudioInputDevices();
   virtual AudioOutputStream* MakeAudioOutputStream(AudioParameters params);
   virtual AudioInputStream* MakeAudioInputStream(AudioParameters params);
   virtual void MuteAll();
   virtual void UnMuteAll();
   virtual string16 GetAudioInputDeviceModel();
 
   // Windows-only methods to free a stream created in MakeAudioStream. These
   // are called internally by the audio stream when it has been closed.
   void ReleaseOutputStream(PCMWaveOutAudioOutputStream* stream);
 
   // Called internally by the audio stream when it has been closed.
   void ReleaseInputStream(PCMWaveInAudioInputStream* stream);
 
  private:
-  friend void DestroyAudioManagerWin(void *);
   virtual ~AudioManagerWin();
+
+  // Number of currently open output streams.
+  int num_output_streams_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioManagerWin);
 };
 
 #endif  // MEDIA_AUDIO_AUDIO_MANAGER_WIN_H_