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

ash/ash_touch_exploration_manager_chromeos.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_TOUCH_EXPLORATION_MANAGER_CHROMEOS_H_
 #define ASH_TOUCH_EXPLORATION_MANAGER_CHROMEOS_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 17 matching lines @@
     : public AccessibilityObserver,
       public ui::TouchExplorationControllerDelegate,
       public aura::client::ActivationChangeObserver {
  public:
   explicit AshTouchExplorationManager(
       RootWindowController* root_window_controller);
   ~AshTouchExplorationManager() override;
 
   // AccessibilityObserver overrides:
   void OnAccessibilityModeChanged(
-      ui::AccessibilityNotificationVisibility notify) override;
+      AccessibilityNotificationVisibility notify) override;
 
   // TouchExplorationControllerDelegate overrides:
   void SetOutputLevel(int volume) override;
   void SilenceSpokenFeedback() override;
   void PlayVolumeAdjustEarcon() override;
   void PlayPassthroughEarcon() override;
   void PlayExitScreenEarcon() override;
   void PlayEnterScreenEarcon() override;
   void HandleAccessibilityGesture(ui::AXGesture gesture) override;
 
@@ skipping 14 matching lines @@
   std::unique_ptr<ui::TouchExplorationController> touch_exploration_controller_;
   RootWindowController* root_window_controller_;
   chromeos::CrasAudioHandler* audio_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(AshTouchExplorationManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_TOUCH_EXPLORATION_MANAGER_CHROMEOS_H_