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### Issue Details

* **Electron Version:**
  * 7.0.0-beta.3
* **Operating System:**
  * macOS 10.14.5
* **Last Known Working Electron version:**
  * 6.0.2

### Expected Behavior
Show file chooser dialog when clicking input type="file" after canceled the dialog.

### Actual Behavior
Can't show file chooser dialog when clicking input type="file" after canceled the dialog.

### To Reproduce

1. Clone and Install source code.
```sh
$ git clone https://github.com/agata/electron-quick-start.git -b bug-for-file-chooser-after-canceled
$ npm install
$ npm start || electron .
```
2. Click <input type="file"> -> Show file chooser dialog.
3. Click cancel button of the dialog -> Close the dialog
4. Click <input type="file"> again -> Can't show file chooser dialog.

### Screenshots
![bug-for-file-chooser-after-canceled](https://user-images.githubusercontent.com/40473/63176157-60916900-c080-11e9-8715-f263319f0e68.gif)

### Additional Information
WebView has same problem.
shell/browser/web_dialog_helper.cc
default:
        NOTREACHED();
    }
    auto* browser_context = static_cast<electron::AtomBrowserContext*>(
        render_frame_host->GetProcess()->GetBrowserContext());
    settings.default_path = browser_context->prefs()
                                ->GetFilePath(prefs::kSelectFileLastDirectory)
                                .Append(params.default_file_name);
    settings.properties = flags;
    file_select_helper->ShowOpenDialog(settings);
  }
}
void WebDialogHelper::EnumerateDirectory(
    content::WebContents* web_contents,
    std::unique_ptr<content::FileSelectListener> listener,
    const base::FilePath& dir) {
  int types = base::FileEnumerator::FILES | base::FileEnumerator::DIRECTORIES |
              base::FileEnumerator::INCLUDE_DOT_DOT;
  base::FileEnumerator file_enum(dir, false, types);
  base::FilePath path;
  std::vector<FileChooserFileInfoPtr> file_info;
  while (!(path = file_enum.Next()).empty()) {
    file_info.push_back(FileChooserFileInfo::NewNativeFile(
        blink::mojom::NativeFileInfo::New(path, base::string16())));
  }
  listener->FileSelected(std::move(file_info), dir,
                         FileChooserParams::Mode::kUploadFolder);
}
}