src/vs/workbench/services/keybinding/browser/keyboardLayoutService.ts/BrowserKeyboardMapperFactoryBase/getUSStandardLayout
class BrowserKeyboardMapperFactoryBase:	getUSStandardLayout() {
		const usStandardLayouts = this._mru.filter(layout => layout.layout.isUSStandard);

		if (usStandardLayouts.length) {
			return usStandardLayouts[0];
		}

		return null;
	}