aura: Remove layerless windows.

ui/views/widget/native_widget_mac_unittest.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.
 
 #import "ui/views/widget/native_widget_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 145 matching lines @@
   int paint_count_;
 
   DISALLOW_COPY_AND_ASSIGN(PaintCountView);
 };
 
 // Test minimized states triggered externally, implied visibility and restored
 // bounds whilst minimized.
 TEST_F(NativeWidgetMacTest, MiniaturizeExternally) {
   Widget* widget = new Widget;
   Widget::InitParams init_params(Widget::InitParams::TYPE_WINDOW);
-  // Don't add a layer, so that calls to paint can be observed synchronously.
-  init_params.layer_type = aura::WINDOW_LAYER_NONE;
+  // Make the layer not drawn, so that calls to paint can be observed
+  // synchronously.
+  init_params.layer_type = ui::LAYER_NOT_DRAWN;
   widget->Init(init_params);
 
   PaintCountView* view = new PaintCountView();
   widget->GetContentsView()->AddChildView(view);
   NSWindow* ns_window = widget->GetNativeWindow();
   WidgetChangeObserver observer(widget);
 
   widget->SetBounds(gfx::Rect(100, 100, 300, 300));
 
   EXPECT_TRUE(view->IsDrawn());
@@ skipping 180 matching lines @@
   NSRect nsrect = gfx::ScreenRectToNSRect(screen_rect);
   NSPoint midpoint = NSMakePoint(NSMidX(nsrect), NSMidY(nsrect));
 
   id hit = [widget->GetNativeWindow() accessibilityHitTest:midpoint];
   id title = [hit accessibilityAttributeValue:NSAccessibilityTitleAttribute];
   EXPECT_NSEQ(title, @"Green");
 }
 
 }  // namespace test
 }  // namespace views