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

ash/common/system/tray/default_system_tray_delegate.h

 // Copyright 2013 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_DEFAULT_SYSTEM_TRAY_DELEGATE_H_
-#define ASH_SYSTEM_TRAY_DEFAULT_SYSTEM_TRAY_DELEGATE_H_
+#ifndef ASH_COMMON_SYSTEM_TRAY_DEFAULT_SYSTEM_TRAY_DELEGATE_H_
+#define ASH_COMMON_SYSTEM_TRAY_DEFAULT_SYSTEM_TRAY_DELEGATE_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
-#include "ash/system/tray/system_tray_delegate.h"
-#include "base/compiler_specific.h"
+#include "ash/common/system/tray/system_tray_delegate.h"
 #include "base/macros.h"
 
 namespace ash {
 
 class ASH_EXPORT DefaultSystemTrayDelegate : public SystemTrayDelegate {
  public:
   DefaultSystemTrayDelegate();
   ~DefaultSystemTrayDelegate() override;
 
   // SystemTrayDelegate
@@ skipping 16 matching lines @@
 
  private:
   bool bluetooth_enabled_;
   std::unique_ptr<VolumeControlDelegate> volume_control_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultSystemTrayDelegate);
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_TRAY_DEFAULT_SYSTEM_TRAY_DELEGATE_H_
+#endif  // ASH_COMMON_SYSTEM_TRAY_DEFAULT_SYSTEM_TRAY_DELEGATE_H_