Convert TrayAccessibility to wm common types

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"
 #include "ash/common/shell_observer.h"
+#include "ash/common/system/accessibility_observer.h"
 #include "ash/common/system/tray/tray_image_item.h"
 #include "ash/common/system/tray/tray_notification_view.h"
 #include "ash/common/system/tray/view_click_listener.h"
 #include "ash/system/tray/tray_details_view.h"
 #include "base/macros.h"
 #include "ui/gfx/font.h"
 #include "ui/views/controls/button/button.h"
 
 namespace chromeos {
 class TrayAccessibilityTest;
 }
 
 namespace views {
 class Button;
 class ImageView;
 class Label;
 class View;
 }
 
 namespace ash {
 class HoverHighlightView;
 class SystemTrayItem;
 
-class ASH_EXPORT AccessibilityObserver {
- public:
-  virtual ~AccessibilityObserver() {}
-
-  // Notifies when accessibility mode changes.
-  virtual void OnAccessibilityModeChanged(
-      ui::AccessibilityNotificationVisibility notify) = 0;
-};
-
-
 namespace tray {
 
 class AccessibilityPopupView : public TrayNotificationView {
  public:
   AccessibilityPopupView(SystemTrayItem* owner, uint32_t enabled_state_bits);
 
   const views::Label* label_for_test() const { return label_; }
 
  private:
   views::Label* CreateLabel(uint32_t enabled_state_bits);
@@ skipping 88 matching lines @@
   // 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_