Decouple c/b/cros/audio from c/b/speech.

chrome/browser/chromeos/audio/audio_mixer_cras.h

Index: chrome/browser/chromeos/audio/audio_mixer_cras.h
diff --git a/chrome/browser/chromeos/audio/audio_mixer_cras.h b/chrome/browser/chromeos/audio/audio_mixer_cras.h
index 5650fb0cfd6ccc7a7135f4ae03329e5a6a95a43e..b91a5b8d72af9aa69d9e9fb9b07314dca20f4bc8 100644
--- a/chrome/browser/chromeos/audio/audio_mixer_cras.h
+++ b/chrome/browser/chromeos/audio/audio_mixer_cras.h
@@ -25,7 +25,7 @@ class AudioMixerCras : public AudioMixer {
   virtual ~AudioMixerCras();
 
   // AudioMixer implementation.
-  virtual void Init() OVERRIDE;
+  virtual void Init(const base::Closure& on_connected) OVERRIDE;
   virtual double GetVolumePercent() OVERRIDE;
   virtual void SetVolumePercent(double percent) OVERRIDE;
   virtual bool IsMuted() OVERRIDE;
@@ -40,7 +40,7 @@ class AudioMixerCras : public AudioMixer {
  private:
   // Tries to connect to CRAS.  On failure, posts a delayed Connect() task to
   // try again.  Failure could occur if the CRAS server isn't running yet.
-  void Connect();
+  void Connect(const base::Closure& on_connected);
 
   // Updates |client_| for current values of |volume_percent_| and
   // |is_muted_|. No-op if not connected.