src/vs/workbench/browser/parts/dialogs/dialogHandler.ts/BrowserDialogHandler/getDialogType
class BrowserDialogHandler:	private getDialogType(severity: Severity): DialogType {
		return (severity === Severity.Info) ? 'question' : (severity === Severity.Error) ? 'error' : (severity === Severity.Warning) ? 'warning' : 'none';
	}