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

content/test/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
@@ skipping 599 matching lines @@
     "../browser/accessibility/accessibility_mode_browsertest.cc",
     "../browser/accessibility/cross_platform_accessibility_browsertest.cc",
     "../browser/accessibility/dump_accessibility_browsertest_base.cc",
     "../browser/accessibility/dump_accessibility_browsertest_base.h",
     "../browser/accessibility/dump_accessibility_events_browsertest.cc",
     "../browser/accessibility/dump_accessibility_tree_browsertest.cc",
     "../browser/accessibility/hit_testing_browsertest.cc",
     "../browser/accessibility/site_per_process_accessibility_browsertest.cc",
     "../browser/accessibility/snapshot_ax_tree_browsertest.cc",
     "../browser/accessibility/touch_accessibility_aura_browsertest.cc",
+    "../browser/appcache/appcache_browsertest.cc",
     "../browser/background_sync/background_sync_browsertest.cc",
     "../browser/battery_monitor_browsertest.cc",
     "../browser/blob_storage/blob_storage_browsertest.cc",
     "../browser/blob_storage/blob_url_browsertest.cc",
     "../browser/bookmarklet_browsertest.cc",
     "../browser/browser_side_navigation_browsertest.cc",
     "../browser/browsing_data/clear_site_data_throttle_browsertest.cc",
     "../browser/browsing_data/conditional_cache_deletion_helper_browsertest.cc",
     "../browser/child_process_launcher_browsertest.cc",
     "../browser/child_process_security_policy_browsertest.cc",
@@ skipping 1290 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }