Convert TrayAccessibility to wm common types

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"
-#include "ash/system/tray_accessibility.h"
+#include "ash/common/system/accessibility_observer.h"
 #include "base/macros.h"
 #include "ui/chromeos/touch_exploration_controller.h"
 #include "ui/wm/public/activation_change_observer.h"
 
 namespace chromeos {
 class CrasAudioHandler;
 }
 
 namespace ash {
 class RootWindowController;
 
 // Responsible for initializing TouchExplorationController when spoken
 // feedback is on for ChromeOS only. This class implements
 // TouchExplorationControllerDelegate which allows touch gestures to manipulate
 // the system.
 class ASH_EXPORT AshTouchExplorationManager
-    : public ash::AccessibilityObserver,
+    : 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;
@@ skipping 24 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_