Update ConstrainedWindowViews appearance according to mock

ui/views/window/dialog_delegate.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/window/dialog_delegate.h"
 
 #include "base/logging.h"
 #include "ui/views/controls/button/text_button.h"
 #include "ui/views/widget/widget.h"
 
@@ skipping 71 matching lines @@
   }
 
   if (default_button & ui::DIALOG_BUTTON_OK)
     return dcv->ok_button();
   if (default_button & ui::DIALOG_BUTTON_CANCEL)
     return dcv->cancel_button();
   return NULL;
 }
 
 ClientView* DialogDelegate::CreateClientView(Widget* widget) {
-  return new DialogClientView(widget, GetContentsView());
+  return new DialogClientView(widget, GetContentsView(),
+                              DialogClientView::STYLE_NATIVE);
 }
 
 const DialogClientView* DialogDelegate::GetDialogClientView() const {
   return GetWidget()->client_view()->AsDialogClientView();
 }
 
 DialogClientView* DialogDelegate::GetDialogClientView() {
   return GetWidget()->client_view()->AsDialogClientView();
 }
 
@@ skipping 12 matching lines @@
 
 Widget* DialogDelegateView::GetWidget() {
   return View::GetWidget();
 }
 
 const Widget* DialogDelegateView::GetWidget() const {
   return View::GetWidget();
 }
 
 }  // namespace views