cros: Enable new cras audio handler by default

ash/system/chromeos/audio/tray_audio.cc

 // 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.
 
 #include "ash/system/chromeos/audio/tray_audio.h"
 
 #include <cmath>
 
 #include "ash/ash_constants.h"
 #include "ash/ash_switches.h"
@@ skipping 39 matching lines @@
 const int kExtraPaddingBetweenBarAndMore = 10;
 
 const int kNoAudioDeviceIcon = -1;
 
 // IDR_AURA_UBER_TRAY_VOLUME_LEVELS contains 5 images,
 // The one for mute is at the 0 index and the other
 // four are used for ascending volume levels.
 const int kVolumeLevels = 4;
 
 bool UseNewAudioHandler() {
-  return CommandLine::ForCurrentProcess()->
-      HasSwitch(ash::switches::kAshEnableNewAudioHandler);
+  return !CommandLine::ForCurrentProcess()->
+      HasSwitch(ash::switches::kAshDisableNewAudioHandler);
 }
 
 bool IsAudioMuted() {
   if(UseNewAudioHandler()) {
     return chromeos::CrasAudioHandler::Get()->IsOutputMuted();
   } else {
     return Shell::GetInstance()->system_tray_delegate()->
         GetVolumeControlDelegate()->IsAudioMuted();
   }
 }
@@ skipping 531 matching lines @@
 
 void TrayAudio::Update() {
   if (audio_detail_)
     audio_detail_->Update();
   if (volume_view_)
     volume_view_->Update();
 }
 
 }  // namespace internal
 }  // namespace ash