The Appcache subresource URL factory needs to inform the URLLoaderClient if there is a failure.

content/browser/appcache/appcache_browsertest.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <stdint.h>
+
+#include "base/command_line.h"
+#include "content/public/common/content_features.h"
+#include "content/public/test/browser_test_utils.h"
+#include "content/public/test/content_browser_test.h"
+#include "content/public/test/content_browser_test_utils.h"
+#include "content/public/test/test_navigation_observer.h"
+#include "content/public/test/test_utils.h"
+#include "content/shell/browser/shell.h"
+#include "net/dns/mock_host_resolver.h"
+#include "net/test/embedded_test_server/embedded_test_server.h"
+
+namespace content {
+
+// This class currently enables the network service feature, which allows us to
+// test the AppCache code in that mode.
+class AppCacheNetworkServiceBrowserTest : public ContentBrowserTest {
+public:
+  AppCacheNetworkServiceBrowserTest() {}
+
+protected:
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    command_line->AppendSwitchASCII("enable-features",

[jam, 2017/07/25 01:00:05]

nit: use content::kEnableFeatures

[ananta, 2017/07/25 01:14:28]

Done.

+      features::kNetworkService.name);

[jam, 2017/07/25 01:00:05]

nit: indentation

[ananta, 2017/07/25 01:14:28]

Done.

+  }
+
+  void SetUpOnMainThread() override {
+    host_resolver()->AddRule("*", "127.0.0.1");

[jam, 2017/07/25 01:00:05]

are you sure you need this? this is for tests that navigate to arbitrary
origins, which this test isn't since it's getting its URLs from the embedded
test server

[ananta, 2017/07/25 01:14:28]

Thanks. Removed.

+    ASSERT_TRUE(embedded_test_server()->Start());
+  }
+};
+
+// This test validates that navigating to a TLD which has an AppCache
+// associated with it and then navigating to another TLD within that
+// host does not hang.
+IN_PROC_BROWSER_TEST_F(AppCacheNetworkServiceBrowserTest,
+                       VerifySubresourceFactoryClearedOnNewNavigation) {
+  if (!base::FeatureList::IsEnabled(features::kNetworkService))

[jam, 2017/07/25 01:00:05]

nit: this isn't needed since the test sets it

[ananta, 2017/07/25 01:14:28]

Removed

+    return;
+
+  GURL main_url = embedded_test_server()->GetURL(
+      "/appcache/simple_page_with_manifest.html");
+
+  TitleWatcher title_watcher(shell()->web_contents(), L"AppCache updated");
+
+  // Load the main page twice. The second navigation should have AppCache
+  // initialized for the page.
+  EXPECT_TRUE(NavigateToURL(shell(), main_url));
+  EXPECT_EQ(title_watcher.WaitAndGetTitle(), L"AppCache updated");
+
+  TestNavigationObserver observer(shell()->web_contents());
+  EXPECT_TRUE(NavigateToURL(shell(), main_url));
+  EXPECT_EQ(main_url, observer.last_navigation_url());
+  EXPECT_TRUE(observer.last_navigation_succeeded());
+
+  GURL page_no_manifest = embedded_test_server()->GetURL(
+      "/appcache/simple_page_no_manifest.html");
+
+  EXPECT_TRUE(NavigateToURL(shell(), page_no_manifest));
+  EXPECT_EQ(page_no_manifest, observer.last_navigation_url());
+  EXPECT_TRUE(observer.last_navigation_succeeded());
+}
+
+}  // namespace content