Update a11y of volume row in CrOS system menu.

ash/common/system/chromeos/audio/tray_audio_delegate_chromeos.cc

Index: ash/common/system/chromeos/audio/tray_audio_delegate_chromeos.cc
diff --git a/ash/common/system/chromeos/audio/tray_audio_delegate_chromeos.cc b/ash/common/system/chromeos/audio/tray_audio_delegate_chromeos.cc
index 0ca538dc8714ded4c6c14d9c78a51d40dea4c246..dfe5defd7e4f47eeea6afa708da8bc2b4268be93 100644
--- a/ash/common/system/chromeos/audio/tray_audio_delegate_chromeos.cc
+++ b/ash/common/system/chromeos/audio/tray_audio_delegate_chromeos.cc
@@ -4,7 +4,6 @@
 
 #include "ash/common/system/chromeos/audio/tray_audio_delegate_chromeos.h"
 
-#include "ash/resources/grit/ash_resources.h"
 #include "ash/resources/vector_icons/vector_icons.h"
 #include "chromeos/audio/cras_audio_handler.h"
 #include "ui/gfx/paint_vector_icon.h"
@@ -26,23 +25,6 @@ int TrayAudioDelegateChromeOs::GetOutputVolumeLevel() {
   return CrasAudioHandler::Get()->GetOutputVolumePercent();
 }
 
-int TrayAudioDelegateChromeOs::GetActiveOutputDeviceIconId() {
-  chromeos::AudioDevice device;
-  if (!CrasAudioHandler::Get()->GetPrimaryActiveOutputDevice(&device))
-    return kNoAudioDeviceIcon;
-
-  if (device.type == chromeos::AUDIO_TYPE_HEADPHONE)
-    return IDR_AURA_UBER_TRAY_AUDIO_HEADPHONE;
-  else if (device.type == chromeos::AUDIO_TYPE_USB)
-    return IDR_AURA_UBER_TRAY_AUDIO_USB;
-  else if (device.type == chromeos::AUDIO_TYPE_BLUETOOTH)
-    return IDR_AURA_UBER_TRAY_AUDIO_BLUETOOTH;
-  else if (device.type == chromeos::AUDIO_TYPE_HDMI)
-    return IDR_AURA_UBER_TRAY_AUDIO_HDMI;
-  else
-    return kNoAudioDeviceIcon;
-}
-
 const gfx::VectorIcon&
 TrayAudioDelegateChromeOs::GetActiveOutputDeviceVectorIcon() {
   chromeos::AudioDevice device;