Refactor Windows MessageBox fallback code.

chrome/browser/ui/simple_message_box.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_SIMPLE_MESSAGE_BOX_H_
 #define CHROME_BROWSER_UI_SIMPLE_MESSAGE_BOX_H_
 
 #include "base/strings/string16.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace chrome {
 
 enum MessageBoxResult {
   MESSAGE_BOX_RESULT_NO = 0,  // User chose NO or CANCEL.
   MESSAGE_BOX_RESULT_YES = 1, // User chose YES or OK.
 };
 
 enum MessageBoxType {
   MESSAGE_BOX_TYPE_INFORMATION,  // Shows an OK button.
   MESSAGE_BOX_TYPE_WARNING,      // Shows an OK button.
   MESSAGE_BOX_TYPE_QUESTION,     // Shows YES and NO buttons.
-  MESSAGE_BOX_TYPE_OK_CANCEL,    // Shows OK and CANCEL buttons (Windows or aura
-                                 // only).
+  MESSAGE_BOX_TYPE_OK_CANCEL,    // Shows OK and CANCEL buttons (Aura only).
 };
 
 // Shows a dialog box with the given |title| and |message|. If |parent| is
 // non-NULL, the box will be made modal to the |parent|, except on Mac, where it
 // is always app-modal.
 //
 // NOTE: In general, you should avoid this since it's usually poor UI.
 // We have a variety of other surfaces such as wrench menu notifications and
 // infobars; consult the UI leads for a recommendation.
 MessageBoxResult ShowMessageBox(gfx::NativeWindow parent,
@@ skipping 10 matching lines @@
 // infobars; consult the UI leads for a recommendation.
 MessageBoxResult ShowMessageBoxWithButtonText(gfx::NativeWindow parent,
                                               const base::string16& title,
                                               const base::string16& message,
                                               const base::string16& yes_text,
                                               const base::string16& no_text);
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_SIMPLE_MESSAGE_BOX_H_