ResourceLoader: Fix a bunch of double-cancellation/double-error notification cases.

content/browser/loader/resource_loader_unittest.cc

Index: content/browser/loader/resource_loader_unittest.cc
diff --git a/content/browser/loader/resource_loader_unittest.cc b/content/browser/loader/resource_loader_unittest.cc
index f4de5225858e3795131e1339c64a5ec23e2722d8..5448e8f797acd892688b6bc378d17e265c1fe996 100644
--- a/content/browser/loader/resource_loader_unittest.cc
+++ b/content/browser/loader/resource_loader_unittest.cc
@@ -1085,7 +1085,7 @@ TEST_F(ResourceLoaderTest, SyncCancelOnReadCompleted) {
 // yet - something the URLRequest doesn't even know about, itself. As a result,
 // the ResourceLoader is notified of cancellation twice.
 // TODO(mmenke): Fix this.
-TEST_F(ResourceLoaderTest, DISABLED_SyncCancelOnReceivedEof) {
+TEST_F(ResourceLoaderTest, SyncCancelOnReceivedEof) {
   raw_ptr_resource_handler_->set_on_on_read_eof_result(false);
 
   loader_->StartRequest();