Convert TrayAccessibility to wm common types

ash/common/accessibility_types.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 UI_CHROMEOS_ACCESSIBILITY_TYPES_H_
-#define UI_CHROMEOS_ACCESSIBILITY_TYPES_H_
+#ifndef ASH_COMMON_ACCESSIBILITY_TYPES_H_
+#define ASH_COMMON_ACCESSIBILITY_TYPES_H_
 
+// TODO(jamescook): Move this to namespace ash. http://crbug.com/621574
 namespace ui {
 
 enum AccessibilityNotificationVisibility {
   A11Y_NOTIFICATION_NONE,
   A11Y_NOTIFICATION_SHOW,
 };
 
 enum AccessibilityAlert {
   A11Y_ALERT_NONE,
   A11Y_ALERT_WINDOW_NEEDED,
@@ skipping 10 matching lines @@
 
 const MagnifierType kDefaultMagnifierType = MAGNIFIER_FULL;
 
 // Factor of magnification scale. For example, when this value is 1.189, scale
 // value will be changed x1.000, x1.189, x1.414, x1.681, x2.000, ...
 // Note: this value is 2.0 ^ (1 / 4).
 const float kMagnificationScaleFactor = 1.18920712f;
 
 }  // namespace ui
 
-#endif  // UI_CHROMEOS_ACCESSIBILITY_TYPES_H_
+#endif  // ASH_COMMON_ACCESSIBILITY_TYPES_H_