Revert of Add support for the audio-output-device switching IPC mechanism to the renderer lower...

media/base/audio_renderer_mixer.h

Index: media/base/audio_renderer_mixer.h
diff --git a/media/base/audio_renderer_mixer.h b/media/base/audio_renderer_mixer.h
index dc9ab925b2435b32ad12c97b27762f8b80edb38c..35ed484976fdb83ee4975b955c10a5e3a296b131 100644
--- a/media/base/audio_renderer_mixer.h
+++ b/media/base/audio_renderer_mixer.h
@@ -6,7 +6,6 @@
 #define MEDIA_BASE_AUDIO_RENDERER_MIXER_H_
 
 #include <map>
-#include <string>
 
 #include "base/synchronization/lock.h"
 #include "base/time/time.h"
@@ -40,10 +39,6 @@
     pause_delay_ = delay;
   }
 
-  void SwitchOutputDevice(const std::string& device_id,
-                          const GURL& security_origin,
-                          const SwitchOutputDeviceCB& callback);
-
  private:
   // AudioRendererSink::RenderCallback implementation.
   int Render(AudioBus* audio_bus, int audio_delay_milliseconds) override;