Fix the typo "visibility".

ash/wm/window_state.h

 // Copyright 2013 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_WM_WINDOW_STATE_H_
 #define ASH_WM_WINDOW_STATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/wm/drag_details.h"
 #include "ash/wm/wm_types.h"
@@ skipping 180 matching lines @@
   // Gets/sets whether the shelf should be hidden when this window is
   // fullscreen.
   bool hide_shelf_when_fullscreen() const {
     return hide_shelf_when_fullscreen_;
   }
 
   void set_hide_shelf_when_fullscreen(bool value) {
     hide_shelf_when_fullscreen_ = value;
   }
 
-  // If the minimum visibilty is true, ash will try to keep a
+  // If the minimum visibility is true, ash will try to keep a
   // minimum amount of the window is always visible on the work area
   // when shown.
   // TODO(oshima): Consolidate this and window_position_managed
   // into single parameter to control the window placement.
   bool minimum_visibility() const {
     return minimum_visibility_;
   }
   void set_minimum_visibility(bool minimum_visibility) {
     minimum_visibility_ = minimum_visibility;
   }
@@ skipping 192 matching lines @@
 ASH_EXPORT WindowState* GetWindowState(aura::Window* window);
 
 // const version of GetWindowState.
 ASH_EXPORT const WindowState*
 GetWindowState(const aura::Window* window);
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_WINDOW_STATE_H_