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

ash/keyboard/keyboard_ui.cc

 // Copyright 2016 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.
 
 #include "ash/keyboard/keyboard_ui.h"
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/system/accessibility_observer.h"
 #include "ash/common/system/tray/wm_system_tray_notifier.h"
 #include "ash/common/wm_shell.h"
@@ skipping 24 matching lines @@
     // to the appropriate keyboard functions.
   }
   bool IsEnabled() override {
     return WmShell::Get()
         ->GetAccessibilityDelegate()
         ->IsVirtualKeyboardEnabled();
   }
 
   // AccessibilityObserver:
   void OnAccessibilityModeChanged(
-      ui::AccessibilityNotificationVisibility notify) override {
+      AccessibilityNotificationVisibility notify) override {
     FOR_EACH_OBSERVER(KeyboardUIObserver, *observers(),
                       OnKeyboardEnabledStateChanged(IsEnabled()));
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(KeyboardUIImpl);
 };
 
 KeyboardUI::~KeyboardUI() {}
 
 // static
 std::unique_ptr<KeyboardUI> KeyboardUI::Create() {
   return base::WrapUnique(new KeyboardUIImpl);
 }
 
 void KeyboardUI::AddObserver(KeyboardUIObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void KeyboardUI::RemoveObserver(KeyboardUIObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 KeyboardUI::KeyboardUI() {}
 
 }  // namespace ash