base::Bind: Remove callback_old.h.

chrome/browser/chromeos/audio_mixer.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_H_
 #define CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_H_
 #pragma once
 
 #include "base/basictypes.h"
-#include "base/callback_old.h"
 
 namespace chromeos {
 
 class AudioMixer {
  public:
   AudioMixer() {}
   virtual ~AudioMixer() {}
 
   // Initializes the connection to the device.  This must be called on the UI
   // thread; blocking tasks may take place in the background.  IsInitialized()
@@ skipping 25 matching lines @@
   // initialization is complete.
   virtual void SetMuted(bool mute) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AudioMixer);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_H_