views: Add an Options enum to MessageBoxView control.

ui/views/examples/message_box_example.cc

 // Copyright (c) 2011 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/message_box_example.h"
 
 #include "base/utf_string_conversions.h"
 #include "ui/views/layout/grid_layout.h"
 #include "views/controls/message_box_view.h"
 #include "views/view.h"
 
 namespace examples {
 
 MessageBoxExample::MessageBoxExample(ExamplesMain* main)
     : ExampleBase(main, "Message Box View") {
 }
 
 MessageBoxExample::~MessageBoxExample() {
 }
 
 void MessageBoxExample::CreateExampleView(views::View* container) {
   message_box_view_ = new views::MessageBoxView(
-      0,
+      views::MessageBoxView::NONE,
       ASCIIToUTF16("Message Box Message"),
       ASCIIToUTF16("Default Prompt"));
   status_ = new views::TextButton(this, ASCIIToUTF16("Show Status"));
   toggle_ = new views::TextButton(this, ASCIIToUTF16("Toggle Checkbox"));
 
   views::GridLayout* layout = new views::GridLayout(container);
   container->SetLayoutManager(layout);
 
   message_box_view_->SetCheckBoxLabel(ASCIIToUTF16("Check Box"));
 
@@ skipping 24 matching lines @@
         ASCIIToUTF16(BoolToOnOff(message_box_view_->IsCheckBoxSelected())));
     PrintStatus(message_box_view_->IsCheckBoxSelected() ?
        "Check Box Selected" : "Check Box Not Selected");
   } else if (sender == toggle_) {
     message_box_view_->SetCheckBoxSelected(
         !message_box_view_->IsCheckBoxSelected());
   }
 }
 
 }  // namespace examples