Get rid of URLLoaderFactory in browser-side case

content/browser/site_per_process_browsertest.cc

Index: content/browser/site_per_process_browsertest.cc
diff --git a/content/browser/site_per_process_browsertest.cc b/content/browser/site_per_process_browsertest.cc
index cbbedc1f236c4f363a491d98a54dfa6a9034e835..b9865ff1337265c1ed16df7b45cb7bc377560c52 100644
--- a/content/browser/site_per_process_browsertest.cc
+++ b/content/browser/site_per_process_browsertest.cc
@@ -2390,11 +2390,16 @@ namespace {
 class FailingURLLoaderImpl : public mojom::URLLoader {
  public:
   explicit FailingURLLoaderImpl(mojom::URLLoaderClientPtr client) {
+    Start(mojom::URLLoaderAssociatedRequest(), std::move(client));
+  }
+
+ private:
+  void Start(mojom::URLLoaderAssociatedRequest request,
+             mojom::URLLoaderClientPtr client) override {
     ResourceRequestCompletionStatus status;
     status.error_code = net::ERR_NOT_IMPLEMENTED;
     client->OnComplete(status);
   }
-
   void FollowRedirect() override {}
   void SetPriority(net::RequestPriority priority,
                    int32_t intra_priority_value) override {}