Fix extension content verification out-of-band hash fetching

extensions/browser/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/features.gni")
 
 source_set("browser") {
   sources = []
 
   deps = [
@@ skipping 809 matching lines @@
     "api/sockets_tcp/sockets_tcp_api_unittest.cc",
     "api/sockets_udp/sockets_udp_api_unittest.cc",
     "api/storage/settings_quota_unittest.cc",
     "api/storage/storage_api_unittest.cc",
     "api/storage/storage_frontend_unittest.cc",
     "api/web_request/form_data_parser_unittest.cc",
     "api/web_request/upload_data_presenter_unittest.cc",
     "api/web_request/web_request_time_tracker_unittest.cc",
     "app_window/app_window_geometry_cache_unittest.cc",
     "computed_hashes_unittest.cc",
+    "content_hash_fetcher_unittest.cc",
     "content_hash_tree_unittest.cc",
     "error_map_unittest.cc",
     "event_listener_map_unittest.cc",
     "event_router_unittest.cc",
     "extension_api_frame_id_map_unittest.cc",
     "extension_icon_image_unittest.cc",
     "extension_pref_value_map_unittest.cc",
     "extension_registry_unittest.cc",
     "extension_throttle_simulation_unittest.cc",
     "extension_throttle_test_support.cc",
@@ skipping 48 matching lines @@
     "//net:test_support",
     "//third_party/leveldatabase",
     "//third_party/zlib:zip",
   ]
 
   if (is_chromeos) {
     sources += [ "api/webcam_private/visca_webcam_unittest.cc" ]
     deps += [ "//chromeos:test_support" ]
   }
 }