Converts remaining usage of WmLayoutManager to aura::LayoutManager

ash/keyboard/keyboard_observer_register.h

 // Copyright 2017 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_KEYBOARD_KEYBOARD_OBSERVER_REGISTER_H_
 #define ASH_KEYBOARD_KEYBOARD_OBSERVER_REGISTER_H_
 
 #include "base/scoped_observer.h"
 
+namespace aura {
+class Window;
+}
+
 namespace keyboard {
 class KeyboardController;
 class KeyboardControllerObserver;
 }
 
 namespace ash {
 
-class WmWindow;
-
 // Helper function to start/stop observing KeyboardController.
 // |keyboard_root_window| is the root window where KeyboardController changes
 // states.  |observer_root_window| is the root window relevant to the
 // |keyboard_observer|. If |keyboard_root_window| is different from
 // |observer_root_window|, this function is a no-op. Otherwise, the observing
 // starts if |keyboard_activated| is true and stops if |keyboard_activated| is
 // false.
 void UpdateKeyboardObserverFromStateChanged(
     bool keyboard_activated,
-    WmWindow* keyboard_root_window,
-    WmWindow* observer_root_window,
+    aura::Window* keyboard_root_window,
+    aura::Window* observer_root_window,
     ScopedObserver<keyboard::KeyboardController,
                    keyboard::KeyboardControllerObserver>* keyboard_observer);
 
 }  // namespace ash
 
 #endif  // ASH_KEYBOARD_KEYBOARD_OBSERVER_REGISTER_H_