fix: resolve crash loading file based serviceworkers (#20132)

shell/browser/net/proxying_url_loader_factory.cc

@@ -695,7 +695,7 @@ void ProxyingURLLoaderFactory::CreateLoaderAndStart(
   // Intercept file:// protocol to support asar archives.
   if (request.url.SchemeIsFile()) {
     asar::CreateAsarURLLoader(request, std::move(loader), std::move(client),
-                              nullptr);
+                              new net::HttpResponseHeaders(""));
     return;
   }
 

spec/chromium-spec.js

@@ -194,8 +194,7 @@ describe('chromium feature', () => {
     })
   })
 
-  // FIXME(robo/nornagon): re-enable these once service workers work
-  describe.skip('navigator.serviceWorker', () => {
+  describe('navigator.serviceWorker', () => {
     it('should register for file scheme', (done) => {
       w = new BrowserWindow({
         show: false,