aura: Remove layerless windows.

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/wm/window_animations.h"
 #include "ash/wm/window_util.h"
 #include "base/auto_reset.h"
 #include "ui/aura/window.h"
@@ skipping 14 matching lines @@
 
 WorkspaceBackdropDelegate::WorkspaceBackdropDelegate(aura::Window* container)
     : background_(NULL),
       container_(container),
       in_restacking_(false) {
   background_ = new views::Widget;
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
   params.parent = container_;
   params.bounds = container_->GetBoundsInScreen();
-  params.layer_type = aura::WINDOW_LAYER_SOLID_COLOR;
+  params.layer_type = ui::LAYER_SOLID_COLOR;
   // To disallow the MRU list from picking this window up it should not be
   // activateable.
   params.activatable = views::Widget::InitParams::ACTIVATABLE_NO;
   background_->Init(params);
   // Do not use the animation system. We don't want the bounds animation and
   // opacity needs to get set to |kBackdropOpacity|.
   ::wm::SetWindowVisibilityAnimationTransition(
       background_->GetNativeView(),
       ::wm::ANIMATE_NONE);
   background_->GetNativeView()->SetName("WorkspaceBackdropDelegate");
@@ skipping 109 matching lines @@
 
 void WorkspaceBackdropDelegate::Show() {
   background_->GetNativeView()->layer()->SetOpacity(0.0f);
   background_->Show();
   ui::ScopedLayerAnimationSettings settings(
       background_->GetNativeView()->layer()->GetAnimator());
   background_->GetNativeView()->layer()->SetOpacity(kBackdropOpacity);
 }
 
 }  // namespace ash