fix(extensions): implement missing web_request hooks (#22655)

Co-authored-by: Jeremy Apthorp <nornagon@nornagon.net>
Co-authored-by: samuelmaddock <samuel.maddock@gmail.com>

spec-main/fixtures/extensions/chrome-webRequest/background.js

@@ -0,0 +1,9 @@
+/* global chrome */
+
+chrome.webRequest.onBeforeRequest.addListener(
+  (details) => {
+    return { cancel: true };
+  },
+  { urls: ['*://127.0.0.1:*'] },
+  ['blocking']
+);