

### Issue Details

* **Electron Version:**
  * 7.1.1
* **Operating System:**
  *  Windows 10 (1803) 
* **Last Known Working Electron version:**
  * 6.1.3

### Expected Behavior
dialog.showMessageBox
https://electronjs.org/docs/api/dialog#dialogshowmessageboxbrowserwindow-options
Returns Promise<Object> - resolves with a promise containing the following properties:
- response Number - The index of the clicked button.
- **checkboxChecked** Boolean - The checked state of the checkbox if checkboxLabel was set. Otherwise false.

### Actual Behavior
checkboxChecked do not change



shell/browser/ui/message_box.h
#ifndef SHELL_BROWSER_UI_MESSAGE_BOX_H_
#define SHELL_BROWSER_UI_MESSAGE_BOX_H_
#include <string>
#include <vector>
#include "base/callback_forward.h"
#include "base/strings/string16.h"
#include "ui/gfx/image/image_skia.h"
namespace electron {
class NativeWindow;
enum class MessageBoxType {
  kNone = 0,
  kInformation,
  kWarning,
  kError,
  kQuestion,
};
enum MessageBoxOptions {