Remove reference to electron-index

This file no longer exists

src/vs/workbench/contrib/webview/browser/pre/service-worker.js

@@ -367,7 +367,7 @@ async function getOuterIframeClient(webviewId) {
 	const allClients = await sw.clients.matchAll({ includeUncontrolled: true });
 	return allClients.filter(client => {
 		const clientUrl = new URL(client.url);
-		const hasExpectedPathName = (clientUrl.pathname === `${rootPath}/` || clientUrl.pathname === `${rootPath}/index.html` || clientUrl.pathname === `${rootPath}/electron-browser-index.html`);
+		const hasExpectedPathName = (clientUrl.pathname === `${rootPath}/` || clientUrl.pathname === `${rootPath}/index.html`);
 		return hasExpectedPathName && clientUrl.searchParams.get('id') === webviewId;
 	});
 }