fix: checks in extensions webRequest when using net.fetch

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.
https://github.com/electron/electron/blob/dc74092a090cb6448951036e951ae0f4d775cc98/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);