Convert TrayAccessibility to wm common types

ash/system/ime/tray_ime_chromeos.h

 // Copyright 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_IME_TRAY_IME_CHROMEOS_H_
 #define ASH_SYSTEM_IME_TRAY_IME_CHROMEOS_H_
 
 #include <stddef.h>
 
+#include "ash/common/system/accessibility_observer.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/system_tray_item.h"
 #include "ash/system/chromeos/virtual_keyboard/virtual_keyboard_observer.h"
 #include "ash/system/ime/ime_observer.h"
-#include "ash/system/tray_accessibility.h"
 #include "base/macros.h"
 
 namespace views {
 class Label;
 }
 
 namespace ash {
 struct IMEInfo;
 
 namespace tray {
@@ skipping 60 matching lines @@
   IMEPropertyInfoList property_list_;
   // Whether the IME label and tray items should be visible.
   bool is_visible_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayIME);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_IME_TRAY_IME_CHROMEOS_H_