MenuButton: support Mac look & feel

ui/views/examples/menu_example.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/examples/menu_example.h"
 
 #include <set>
 
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/base/models/simple_menu_model.h"
 #include "ui/views/controls/button/menu_button.h"
 #include "ui/views/controls/button/menu_button_listener.h"
 #include "ui/views/controls/menu/menu_runner.h"
-#include "ui/views/layout/fill_layout.h"
+#include "ui/views/layout/box_layout.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 using base::ASCIIToUTF16;
 
 namespace views {
 namespace examples {
 
 namespace {
 
@@ skipping 185 matching lines @@
 MenuExample::MenuExample() : ExampleBase("Menu") {
 }
 
 MenuExample::~MenuExample() {
 }
 
 void MenuExample::CreateExampleView(View* container) {
   // We add a button to open a menu.
   ExampleMenuButton* menu_button = new ExampleMenuButton(
       ASCIIToUTF16("Open a menu"));
-  container->SetLayoutManager(new FillLayout);
+  container->SetLayoutManager(new BoxLayout(BoxLayout::kVertical, 1, 1, 1));
   container->AddChildView(menu_button);
 }
 
 }  // namespace examples
 }  // namespace views