cros: Move TrayBluetoothHelper out of chrome into ash

chrome/browser/ui/ash/system_tray_delegate_chromeos.h

Index: chrome/browser/ui/ash/system_tray_delegate_chromeos.h
diff --git a/chrome/browser/ui/ash/system_tray_delegate_chromeos.h b/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
index f65d89d249121521dda7ba173252c3ad9625a383..ed0b02944b64093b95e6775d8c995a9f70b1e5d5 100644
--- a/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
+++ b/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
@@ -43,8 +43,6 @@ namespace user_manager {
 class User;
 }
 
-class TrayBluetoothHelper;
-
 namespace chromeos {
 
 class SystemTrayDelegateChromeOS
@@ -206,9 +204,6 @@ class SystemTrayDelegateChromeOS
   bool is_active_directory_managed_ = false;
   bool session_started_ = false;
 
-  // TODO(jamescook): Move into //ash. http://crbug.com/660043
-  std::unique_ptr<TrayBluetoothHelper> bluetooth_helper_;
-
   std::unique_ptr<ash::NetworkingConfigDelegate> networking_config_delegate_;
   std::unique_ptr<AccessibilityStatusSubscription> accessibility_subscription_;