cros: Enable new cras audio handler by default

chrome/browser/chromeos/system/ash_system_tray_delegate.cc

Index: chrome/browser/chromeos/system/ash_system_tray_delegate.cc
diff --git a/chrome/browser/chromeos/system/ash_system_tray_delegate.cc b/chrome/browser/chromeos/system/ash_system_tray_delegate.cc
index 5bd64e8ad6034f62ee6e02f2929810082c6698de..6e44a1fbd869c41b6a9b023fc09c1cd3028c0f9c 100644
--- a/chrome/browser/chromeos/system/ash_system_tray_delegate.cc
+++ b/chrome/browser/chromeos/system/ash_system_tray_delegate.cc
@@ -118,6 +118,11 @@ const int kSessionLengthLimitMinMs = 30 * 1000;  // 30 seconds.
 // The maximum session length limit that can be set.
 const int kSessionLengthLimitMaxMs = 24 * 60 * 60 * 1000;  // 24 hours.
 
+bool UseNewAudioHandler() {
+  return !CommandLine::ForCurrentProcess()->
+      HasSwitch(ash::switches::kAshDisableNewAudioHandler);
+}
+
 ash::NetworkIconInfo CreateNetworkIconInfo(const Network* network) {
   ash::NetworkIconInfo info;
   info.name = network->type() == TYPE_ETHERNET ?
@@ -300,8 +305,7 @@ class SystemTrayDelegate : public ash::SystemTrayDelegate,
   }
 
   virtual void Initialize() OVERRIDE {
-    if (!CommandLine::ForCurrentProcess()->
-            HasSwitch(ash::switches::kAshEnableNewAudioHandler)) {
+    if (!UseNewAudioHandler()) {
       AudioHandler::GetInstance()->AddVolumeObserver(this);
     }
     DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(this);
@@ -364,9 +368,7 @@ class SystemTrayDelegate : public ash::SystemTrayDelegate,
   }
 
   virtual ~SystemTrayDelegate() {
-    if (!CommandLine::ForCurrentProcess()->
-            HasSwitch(ash::switches::kAshEnableNewAudioHandler) &&
-         AudioHandler::GetInstance()) {
+    if (!UseNewAudioHandler() && AudioHandler::GetInstance()) {
       AudioHandler::GetInstance()->RemoveVolumeObserver(this);
     }