Remove keyboard usability mode

ash/display/display_controller.h

 // Copyright (c) 2012 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_DISPLAY_DISPLAY_CONTROLLER_H_
 #define ASH_DISPLAY_DISPLAY_CONTROLLER_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 72 matching lines @@
   static int64 GetPrimaryDisplayId();
 
   CursorWindowController* cursor_window_controller() {
     return cursor_window_controller_.get();
   }
 
   MirrorWindowController* mirror_window_controller() {
     return mirror_window_controller_.get();
   }
 
-  VirtualKeyboardWindowController* virtual_keyboard_window_controller() {
-    return virtual_keyboard_window_controller_.get();
-  }
-
   // Create a WindowTreeHost for the primary display. This replaces
   // |initial_bounds| in |init_params|.
   void CreatePrimaryHost(const AshWindowTreeHostInitParams& init_params);
 
   // Initializes all displays.
   void InitDisplays();
 
   // Add/Remove observers.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
@@ skipping 102 matching lines @@
   ObserverList<Observer> observers_;
 
   // Store the primary window tree host temporarily while replacing
   // display.
   AshWindowTreeHost* primary_tree_host_for_replace_;
 
   scoped_ptr<FocusActivationStore> focus_activation_store_;
 
   scoped_ptr<CursorWindowController> cursor_window_controller_;
   scoped_ptr<MirrorWindowController> mirror_window_controller_;
-  scoped_ptr<VirtualKeyboardWindowController>
-      virtual_keyboard_window_controller_;
 
   // Stores the curent cursor location (in native coordinates) used to
   // restore the cursor location when display configuration
   // changed.
   gfx::Point cursor_location_in_native_coords_for_restore_;
 
   base::WeakPtrFactory<DisplayController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_DISPLAY_CONTROLLER_H_