Make ResourceFetcher return Resources with LoadError instead of nullptrs.

third_party/WebKit/Source/core/fetch/ResourceFetcherTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 99 matching lines @@
 
     Resource* create(const ResourceRequest& request, const ResourceLoaderOptions& options, const String& charset) const override
     {
         return Resource::create(request, type(), options);
     }
 };
 
 TEST_F(ResourceFetcherTest, StartLoadAfterFrameDetach)
 {
     KURL secureURL(ParsedURLString, "https://secureorigin.test/image.png");
-    // Try to request a url. The request should fail, no resource should be returned,
-    // and no resource should be present in the cache.
+    // Try to request a url. The request should fail, and a resource in an error state
+    // should be returned, and no resource should be present in the cache.
     ResourceFetcher* fetcher = ResourceFetcher::create(nullptr);
     FetchRequest fetchRequest = FetchRequest(ResourceRequest(secureURL), FetchInitiatorInfo());
     Resource* resource = fetcher->requestResource(fetchRequest, TestResourceFactory());
-    EXPECT_FALSE(resource);
+    ASSERT_TRUE(resource);
+    EXPECT_TRUE(resource->errorOccurred());
+    EXPECT_TRUE(resource->resourceError().isAccessCheck());
     EXPECT_FALSE(memoryCache()->resourceForURL(secureURL));
 
     // Start by calling startLoad() directly, rather than via requestResource().
     // This shouldn't crash.
     fetcher->startLoad(Resource::create(secureURL, Resource::Raw));
 }
 
 TEST_F(ResourceFetcherTest, UseExistingResource)
 {
     ResourceFetcher* fetcher = ResourceFetcher::create(ResourceFetcherTestMockFetchContext::create());
@@ skipping 541 matching lines @@
     FetchRequest fetchRequest = FetchRequest(url, FetchInitiatorInfo());
     Platform::current()->getURLLoaderMockFactory()->registerURL(url, WebURLResponse(), "");
     Resource* newResource = fetcher->requestResource(fetchRequest, TestResourceFactory(Resource::Raw));
     fetcher->stopFetching();
     Platform::current()->getURLLoaderMockFactory()->unregisterURL(url);
 
     EXPECT_NE(resource, newResource);
 }
 
 } // namespace blink