Removes a couple more functions from WmWindow

ash/wm/maximize_mode/workspace_backdrop_delegate.cc

 // Copyright 2014 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/wm/maximize_mode/workspace_backdrop_delegate.h"
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
 #include "ash/wm/workspace/workspace_layout_manager_backdrop_delegate.h"
 #include "ash/wm_window.h"
@@ skipping 17 matching lines @@
     : container_(container), in_restacking_(false) {
   background_ = new views::Widget;
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
   params.bounds = container_->GetBoundsInScreen();
   params.layer_type = ui::LAYER_SOLID_COLOR;
   params.name = "WorkspaceBackdropDelegate";
   // To disallow the MRU list from picking this window up it should not be
   // activateable.
   params.activatable = views::Widget::InitParams::ACTIVATABLE_NO;
-  DCHECK_NE(kShellWindowId_Invalid, container_->GetShellWindowId());
+  DCHECK_NE(kShellWindowId_Invalid, container_->aura_window()->id());
   container_->GetRootWindowController()->ConfigureWidgetInitParamsForContainer(
-      background_, container_->GetShellWindowId(), &params);
+      background_, container_->aura_window()->id(), &params);
   background_->Init(params);
   background_window_ = WmWindow::Get(background_->GetNativeWindow());
   // Do not use the animation system. We don't want the bounds animation and
   // opacity needs to get set to |kBackdropOpacity|.
   background_window_->SetVisibilityAnimationTransition(::wm::ANIMATE_NONE);
   background_window_->GetLayer()->SetColor(SK_ColorBLACK);
   // Make sure that the layer covers visibly everything - including the shelf.
   background_window_->GetLayer()->SetBounds(params.bounds);
   DCHECK(background_window_->GetBounds() == params.bounds);
   Show();
@@ skipping 73 matching lines @@
 void WorkspaceBackdropDelegate::Show() {
   background_window_->GetLayer()->SetOpacity(0.0f);
   background_->Show();
   background_->SetFullscreen(true);
   ui::ScopedLayerAnimationSettings settings(
       background_window_->GetLayer()->GetAnimator());
   background_window_->GetLayer()->SetOpacity(kBackdropOpacity);
 }
 
 }  // namespace ash