aura: Remove layerless windows.

ui/views/widget/native_widget_mac.mm

 // 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 "ui/views/widget/native_widget_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 83 matching lines @@
   OnSizeConstraintsChanged();
 
   bridge_->SetFocusManager(GetWidget()->GetFocusManager());
 
   DCHECK(GetWidget()->GetRootView());
   bridge_->SetRootView(GetWidget()->GetRootView());
 
   // "Infer" must be handled by ViewsDelegate::OnBeforeWidgetInit().
   DCHECK_NE(Widget::InitParams::INFER_OPACITY, params.opacity);
   bool translucent = params.opacity == Widget::InitParams::TRANSLUCENT_WINDOW;
-  switch (params.layer_type) {
-    case aura::WINDOW_LAYER_NONE:
-      break;
-    case aura::WINDOW_LAYER_TEXTURED:
-      bridge_->CreateLayer(ui::LAYER_TEXTURED, translucent);
-      break;
-    case aura::WINDOW_LAYER_NOT_DRAWN:
-      bridge_->CreateLayer(ui::LAYER_NOT_DRAWN, translucent);
-      break;
-    case aura::WINDOW_LAYER_SOLID_COLOR:
-      bridge_->CreateLayer(ui::LAYER_SOLID_COLOR, translucent);
-      break;
-  }
+  bridge_->CreateLayer(params.layer_type, translucent);
 }
 
 NonClientFrameView* NativeWidgetMac::CreateNonClientFrameView() {
   return new NativeFrameView(GetWidget());
 }
 
 bool NativeWidgetMac::ShouldUseNativeFrame() const {
   return true;
 }
 
@@ skipping 515 matching lines @@
 }
 
 // static
 gfx::FontList NativeWidgetPrivate::GetWindowTitleFontList() {
   NOTIMPLEMENTED();
   return gfx::FontList();
 }
 
 }  // namespace internal
 }  // namespace views