Make ResourceFetcher return Resources with LoadError instead of nullptrs.

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

Index: third_party/WebKit/Source/core/fetch/ResourceFetcherTest.cpp
diff --git a/third_party/WebKit/Source/core/fetch/ResourceFetcherTest.cpp b/third_party/WebKit/Source/core/fetch/ResourceFetcherTest.cpp
index 4c3ffdb9bf639ac3c1c8180d5985e452cbf23a66..1fdfb82bb1ef0fbaf8d2d30a75fcf967991df4ba 100644
--- a/third_party/WebKit/Source/core/fetch/ResourceFetcherTest.cpp
+++ b/third_party/WebKit/Source/core/fetch/ResourceFetcherTest.cpp
@@ -117,12 +117,14 @@ public:
 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().