test: webRequest no crash

Several DCHECKs require `frame_host` data to proceed with proxying.
https://source.chromium.org/chromium/chromium/src/+/main:extensions/browser/api/web_request/web_request_api.cc;l=446-450;drc=f5e280b6c11f41545154266cd2317d3c730e9b30

Note that even if our URLLoader is updated to not use `content::ContentBrowserClient::URLLoaderFactoryType::kNavigation`, further checks are still thrown.
dc74092a09/shell/browser/electron_browser_context.cc (L547)

shell/browser/electron_browser_client.cc

@@ -1310,7 +1310,11 @@ void ElectronBrowserClient::WillCreateURLLoaderFactory(
   DCHECK(web_request.get());
 
 #if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
-  if (!web_request->HasListener()) {
+  // If Electron's webRequest API has no listeners, proxy requests using
+  // chrome.webRequest extension APIs.
+  // Note that Electron's net.fetch and protocol.handle APIs do not include the
+  // frame host which is required for proxying requests.
+  if (!web_request->HasListener() && frame_host) {
     auto* web_request_api = extensions::BrowserContextKeyedAPIFactory<
         extensions::WebRequestAPI>::Get(browser_context);
 

spec/extensions-spec.ts

@@ -1,4 +1,4 @@
-import { app, session, BrowserWindow, ipcMain, WebContents, Extension, Session } from 'electron/main';
+import { app, session, BrowserWindow, ipcMain, net, WebContents, Extension, Session } from 'electron/main';
 
 import { expect } from 'chai';
 import * as WebSocket from 'ws';
@@ -434,6 +434,12 @@ describe('chrome extensions', () => {
         });
       });
     });
+
+    it('does not crash when net.fetch is called', async () => {
+      await session.defaultSession.loadExtension(path.join(fixtures, 'extensions', 'chrome-webRequest-non-blocking'));
+      const requestUrl = `${url}/test.zip`;
+      await net.fetch(requestUrl);
+    });
   });
 
   describe('chrome.tabs', () => {

spec/fixtures/extensions/chrome-webRequest-non-blocking/background.js

@@ -0,0 +1,9 @@
+/* global chrome */
+
+chrome.webRequest.onBeforeRequest.addListener(
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  (details) => {
+    console.log(details);
+  },
+  { urls: ['<all_urls>'] }
+);

spec/fixtures/extensions/chrome-webRequest-non-blocking/manifest.json

@@ -0,0 +1,10 @@
+{
+  "name": "chrome-webRequest-non-blocking",
+  "version": "1.0",
+  "background": {
+    "service_worker": "background.js"
+  },
+  "permissions": ["webRequest"],
+  "manifest_version": 3,
+  "host_permissions": ["<all_urls>"]
+}