mash: Move SystemTrayDelegate and dependencies to //ash/common

ash/common/system/tray/system_tray_delegate.h

 // 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.
 
-#ifndef ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
-#define ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
+#ifndef ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
+#define ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "ash/ash_export.h"
-#include "ash/system/user/login_status.h"
-#include "ash/volume_control_delegate.h"
+#include "ash/common/login_status.h"
+#include "ash/common/system/volume_control_delegate.h"
 #include "base/callback_forward.h"
 #include "base/files/file_path.h"
 #include "base/i18n/time_formatting.h"
 #include "base/strings/string16.h"
 #include "ui/gfx/image/image_skia.h"
 
 class AccountId;
 
 namespace base {
 class TimeDelta;
@@ skipping 307 matching lines @@
   // specified by the device policy |DeviceRebootOnShutdown|. This function
   // asynchronously calls |callback| once a trusted policy becomes available.
   virtual void ShouldRebootOnShutdown(const RebootOnShutdownCallback& callback);
 
   // Returns VPNDelegate. May return nullptr.
   virtual VPNDelegate* GetVPNDelegate() const;
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
+#endif  // ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_