Update a11y of volume row in CrOS system menu.

ash/common/system/chromeos/audio/tray_audio_delegate.h

 // Copyright 2014 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 ASH_COMMON_SYSTEM_CHROMEOS_AUDIO_TRAY_AUDIO_DELEGATE_H_
 #define ASH_COMMON_SYSTEM_CHROMEOS_AUDIO_TRAY_AUDIO_DELEGATE_H_
 
 namespace gfx {
 struct VectorIcon;
 }
@@ skipping 12 matching lines @@
   virtual ~TrayAudioDelegate() {}
 
   // Sets the volume level of the output device to the minimum level which is
   // deemed to be audible.
   virtual void AdjustOutputVolumeToAudibleLevel() = 0;
 
   // Gets the default level in the range 0%-100% at which the output device
   // should be muted.
   virtual int GetOutputDefaultVolumeMuteLevel() = 0;
 
-  // Gets the non-MD icon to use for the active output device.
-  // TODO(mohsen): Remove this once material design is enabled by default. See
-  // https://crbug.com/614453.
-  virtual int GetActiveOutputDeviceIconId() = 0;
-
   // Gets the MD icon to use for the active output device.
   virtual const gfx::VectorIcon& GetActiveOutputDeviceVectorIcon() = 0;
 
   // Returns the volume level of the output device in the range 0%-100%.
   virtual int GetOutputVolumeLevel() = 0;
 
   // Returns true if the device has alternative inputs or outputs.
   virtual bool HasAlternativeSources() = 0;
 
   // Returns whether the output volume is muted.
@@ skipping 15 matching lines @@
   // re-discovering the active HDMI output device again if it has been in the
   // middle of rediscovering the HDMI active output device.
   virtual void SetActiveHDMIOutoutRediscoveringIfNecessary(
       bool force_rediscovering) = 0;
 };
 
 }  // namespace system
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_AUDIO_TRAY_AUDIO_DELEGATE_H_