Revert 138278 - Fix the volume controlling behaviors.

chrome/browser/chromeos/audio/audio_handler.h

Index: chrome/browser/chromeos/audio/audio_handler.h
===================================================================
--- chrome/browser/chromeos/audio/audio_handler.h	(revision 138298)
+++ chrome/browser/chromeos/audio/audio_handler.h	(working copy)
@@ -33,10 +33,6 @@
   static void Initialize();
   static void Shutdown();
 
-  // Same as Initialize but using the specified audio mixer.  It takes
-  // ownership of |mixer|.
-  static void InitializeForTesting(AudioMixer* mixer);
-
   // GetInstance returns NULL if not initialized or if already shutdown.
   static AudioHandler* GetInstance();
 
@@ -66,8 +62,7 @@
   // and constructor/destructor private as recommended for Singletons.
   friend struct DefaultSingletonTraits<AudioHandler>;
 
-  // Takes ownership of |mixer|.
-  explicit AudioHandler(AudioMixer* mixer);
+  AudioHandler();
   virtual ~AudioHandler();
 
   scoped_ptr<AudioMixer> mixer_;