Update SetPaintToLayer to accept LayerType

ui/views/controls/combobox/combobox.cc

 // Copyright (c) 2012 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/controls/combobox/combobox.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 424 matching lines @@
   }
 
   text_button_->SetVisible(true);
   arrow_button_->SetVisible(true);
   AddChildView(text_button_);
   AddChildView(arrow_button_);
 
   // A layer is applied to make sure that canvas bounds are snapped to pixel
   // boundaries (for the sake of drawing the arrow).
   if (UseMd()) {
-    SetPaintToLayer(true);
+    SetPaintToLayer();
     layer()->SetFillsBoundsOpaquely(false);
   } else {
     arrow_image_ = PlatformStyle::CreateComboboxArrow(enabled(), style);
   }
 }
 
 Combobox::~Combobox() {
   if (GetInputMethod() && selector_.get()) {
     // Combobox should have been blurred before destroy.
     DCHECK(selector_.get() != GetInputMethod()->GetTextInputClient());
@@ skipping 553 matching lines @@
   const int kMdPaddingWidth = 8;
   int arrow_pad = UseMd() ? kMdPaddingWidth
                           : PlatformStyle::kComboboxNormalArrowPadding;
   int padding = style_ == STYLE_NORMAL
                     ? arrow_pad * 2
                     : kActionLeftPadding + kActionRightPadding;
   return ArrowSize().width() + padding;
 }
 
 }  // namespace views