mash: Move accessibility_types.h from ui namespace to ash namespace

ash/system/tray_accessibility.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_ACCESSIBILITY_H_
 #define ASH_SYSTEM_TRAY_ACCESSIBILITY_H_
 
 #include <stdint.h>
 
 #include "ash/common/accessibility_delegate.h"
@@ skipping 97 matching lines @@
   // Overridden from TrayImageItem.
   bool GetInitialVisibility() override;
   views::View* CreateDefaultView(LoginStatus status) override;
   views::View* CreateDetailedView(LoginStatus status) override;
   void DestroyDefaultView() override;
   void DestroyDetailedView() override;
   void UpdateAfterLoginStatusChange(LoginStatus status) override;
 
   // Overridden from AccessibilityObserver.
   void OnAccessibilityModeChanged(
-      ui::AccessibilityNotificationVisibility notify) override;
+      AccessibilityNotificationVisibility notify) override;
 
   views::View* default_;
   tray::AccessibilityPopupView* detailed_popup_;
   tray::AccessibilityDetailedView* detailed_menu_;
 
   // Bitmap of fvalues from AccessibilityState.  Can contain any or
   // both of A11Y_SPOKEN_FEEDBACK A11Y_BRAILLE_DISPLAY_CONNECTED.
   uint32_t request_popup_view_state_;
 
   bool tray_icon_visible_;
   LoginStatus login_;
 
   // Bitmap of values from AccessibilityState enum.
   uint32_t previous_accessibility_state_;
 
   // A11y feature status on just entering the lock screen.
   bool show_a11y_menu_on_lock_screen_;
 
   friend class chromeos::TrayAccessibilityTest;
   DISALLOW_COPY_AND_ASSIGN(TrayAccessibility);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_ACCESSIBILITY_H_