views: Add a new ctor to MessageBoxView that takes only a InitParams.

ui/views/examples/message_box_example.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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/message_box_example.h"
 
 #include "base/utf_string_conversions.h"
 #include "ui/views/controls/message_box_view.h"
 #include "ui/views/layout/grid_layout.h"
 #include "ui/views/view.h"
 
 namespace views {
 namespace examples {
 
 MessageBoxExample::MessageBoxExample() : ExampleBase("Message Box View") {
 }
 
 MessageBoxExample::~MessageBoxExample() {
 }
 
 void MessageBoxExample::CreateExampleView(View* container) {
   message_box_view_ = new MessageBoxView(
-      views::MessageBoxView::NO_OPTIONS,
-      ASCIIToUTF16("Message Box Message"),
-      ASCIIToUTF16("Default Prompt"));
+      MessageBoxView::InitParams(ASCIIToUTF16("Hello, world!")));
   status_ = new TextButton(this, ASCIIToUTF16("Show Status"));
   toggle_ = new TextButton(this, ASCIIToUTF16("Toggle Checkbox"));
 
   GridLayout* layout = new GridLayout(container);
   container->SetLayoutManager(layout);
 
   message_box_view_->SetCheckBoxLabel(ASCIIToUTF16("Check Box"));
 
   const int message_box_column = 0;
   ColumnSet* column_set = layout->AddColumnSet(message_box_column);
@@ skipping 22 matching lines @@
     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
 }  // namespace views