Remove keyboard usability mode

ash/display/virtual_keyboard_window_controller.h

Index: ash/display/virtual_keyboard_window_controller.h
diff --git a/ash/display/virtual_keyboard_window_controller.h b/ash/display/virtual_keyboard_window_controller.h
deleted file mode 100644
index 23dd40635761932207ae0f6547d09a53bab19127..0000000000000000000000000000000000000000
--- a/ash/display/virtual_keyboard_window_controller.h
+++ /dev/null
@@ -1,63 +0,0 @@
-// 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_DISPLAY_VIRTUAL_KEYBOARD_WINDOW_CONTROLLER_H_
-#define ASH_DISPLAY_VIRTUAL_KEYBOARD_WINDOW_CONTROLLER_H_
-
-#include "ash/ash_export.h"
-#include "ash/shell_observer.h"
-#include "base/compiler_specific.h"
-#include "base/memory/scoped_ptr.h"
-#include "ui/gfx/display.h"
-
-namespace keyboard {
-class KeyboardController;
-}
-
-namespace ash {
-class DisplayInfo;
-class RootWindowController;
-
-namespace test {
-class VirtualKeyboardWindowControllerTest;
-}  // namespace test
-
-// This class maintains the RootWindowController dedicated for
-// virtual keyboard.
-class ASH_EXPORT VirtualKeyboardWindowController : public ShellObserver {
- public:
-  VirtualKeyboardWindowController();
-  virtual ~VirtualKeyboardWindowController();
-
-  void ActivateKeyboard(keyboard::KeyboardController* keyboard_controller);
-
-  // Updates the root window's bounds using |display_info|.
-  // Creates the new root window if one doesn't exist.
-  void UpdateWindow(const DisplayInfo& display_info);
-
-  // Close the mirror window.
-  void Close();
-
-  // ShellObserver:
-  virtual void OnMaximizeModeStarted() OVERRIDE;
-  virtual void OnMaximizeModeEnded() OVERRIDE;
-
- private:
-  friend class test::VirtualKeyboardWindowControllerTest;
-
-  // Rotates virtual keyboard display by 180 degrees.
-  void FlipDisplay();
-
-  RootWindowController* root_window_controller_for_test() {
-    return root_window_controller_.get();
-  }
-
-  scoped_ptr<RootWindowController> root_window_controller_;
-
-  DISALLOW_COPY_AND_ASSIGN(VirtualKeyboardWindowController);
-};
-
-}  // namespace ash
-
-#endif  // ASH_DISPLAY_VIRTUAL_KEYBOARD_WINDOW_CONTROLLER_H_