mash: Move tray_constants.h and FixedSizedImageView to //ash/common

ash/system/user/user_view.h

 // Copyright 2014 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_USER_USER_VIEW_H_
 #define ASH_SYSTEM_USER_USER_VIEW_H_
 
 #include <memory>
 
 #include "ash/common/session/session_types.h"
-#include "ash/system/tray/tray_constants.h"
+#include "ash/common/system/tray/tray_constants.h"
 #include "ash/system/user/login_status.h"
 #include "ash/system/user/tray_user.h"
 #include "base/macros.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/layout/box_layout.h"
 #include "ui/views/mouse_watcher.h"
 #include "ui/views/view.h"
 
 namespace gfx {
@@ skipping 76 matching lines @@
   // The focus manager which we use to detect focus changes.
   views::FocusManager* focus_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(UserView);
 };
 
 }  // namespace tray
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_USER_USER_VIEW_H_