Converts remaining usage of WmLayoutManager to aura::LayoutManager

ash/keyboard/keyboard_observer_register.cc

 // 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.
 
 #include "ash/keyboard/keyboard_observer_register.h"
 
 #include "ui/keyboard/keyboard_controller.h"
 
 namespace ash {
 
 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) {
   if (keyboard_root_window != observer_root_window)
     return;
 
   keyboard::KeyboardController* const keyboard_controller =
       keyboard::KeyboardController::GetInstance();
   if (keyboard_activated &&
       !keyboard_observer->IsObserving(keyboard_controller)) {
     keyboard_observer->Add(keyboard_controller);
   } else if (!keyboard_activated &&
              keyboard_observer->IsObserving(keyboard_controller)) {
     keyboard_observer->Remove(keyboard_controller);
   }
 }
 
 }  // namespace ash