fix: webRequest module should work with file:// protocol (#22903)

* fix: override file:// instead of intercepting

* test: webRequest module should work with file://

* fix: service work with file:// url

* fix: original_response_headers can be null

* fix: only register file:// when necessary

shell/browser/net/proxying_url_loader_factory.cc

@@ -825,8 +825,11 @@ void ProxyingURLLoaderFactory::CreateLoaderAndStart(
     return;
   }
 
-  // Intercept file:// protocol to support asar archives.
-  if (request.url.SchemeIsFile()) {
+  // The loader of ServiceWorker forbids loading scripts from file:// URLs, and
+  // Chromium does not provide a way to override this behavior. So in order to
+  // make ServiceWorker work with file:// URLs, we have to intercept its
+  // requests here.
+  if (IsForServiceWorkerScript() && request.url.SchemeIsFile()) {
     asar::CreateAsarURLLoader(request, std::move(loader), std::move(client),
                               new net::HttpResponseHeaders(""));
     return;