Centralizes more shared code between ash and mash

ash/aura/wm_root_window_controller_aura.cc

 // Copyright 2016 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/aura/wm_root_window_controller_aura.h"
 
 #include "ash/aura/wm_shelf_aura.h"
 #include "ash/aura/wm_shell_aura.h"
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/shelf/shelf_widget.h"
@@ skipping 49 matching lines @@
 }
 
 bool WmRootWindowControllerAura::HasShelf() {
   return root_window_controller_->wm_shelf_aura()->shelf_widget() != nullptr;
 }
 
 WmShell* WmRootWindowControllerAura::GetShell() {
   return WmShell::Get();
 }
 
-AlwaysOnTopController* WmRootWindowControllerAura::GetAlwaysOnTopController() {
-  return root_window_controller_->always_on_top_controller();
-}
-
 WmShelf* WmRootWindowControllerAura::GetShelf() {
   return root_window_controller_->wm_shelf_aura();
 }
 
 WmWindow* WmRootWindowControllerAura::GetWindow() {
   return WmWindowAura::Get(root_window_controller_->GetRootWindow());
 }
 
 void WmRootWindowControllerAura::ConfigureWidgetInitParamsForContainer(
     views::Widget* widget,
@@ skipping 27 matching lines @@
   root_window_controller_->OnInitialWallpaperAnimationStarted();
   WmRootWindowController::OnInitialWallpaperAnimationStarted();
 }
 
 void WmRootWindowControllerAura::OnWallpaperAnimationFinished(
     views::Widget* widget) {
   root_window_controller_->OnWallpaperAnimationFinished(widget);
   WmRootWindowController::OnWallpaperAnimationFinished(widget);
 }
 
+bool WmRootWindowControllerAura::ShouldDestroyWindowInCloseChildWindows(
+    WmWindow* window) {
+  return WmWindowAura::GetAuraWindow(window)->owned_by_parent();
+}
+
 }  // namespace ash