Fix extension content verification out-of-band hash fetching

extensions/extensions_tests.gypi

 # Copyright 2015 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.
 
 {
   'variables': {
     'extensions_browsertests_sources': [
       'browser/api/audio/audio_apitest.cc',
       'browser/api/bluetooth_socket/bluetooth_socket_apitest.cc',
       'browser/api/display_source/display_source_apitest.cc',
@@ skipping 57 matching lines @@
       'browser/api/sockets_tcp/sockets_tcp_api_unittest.cc',
       'browser/api/sockets_udp/sockets_udp_api_unittest.cc',
       'browser/api/storage/settings_quota_unittest.cc',
       'browser/api/storage/storage_api_unittest.cc',
       'browser/api/storage/storage_frontend_unittest.cc',
       'browser/api/web_request/form_data_parser_unittest.cc',
       'browser/api/web_request/upload_data_presenter_unittest.cc',
       'browser/api/web_request/web_request_time_tracker_unittest.cc',
       'browser/app_window/app_window_geometry_cache_unittest.cc',
       'browser/computed_hashes_unittest.cc',
+      'browser/content_hash_fetcher_unittest.cc',
       'browser/content_hash_tree_unittest.cc',
       'browser/error_map_unittest.cc',
       'browser/event_listener_map_unittest.cc',
       'browser/event_router_unittest.cc',
       'browser/extension_api_frame_id_map_unittest.cc',
       'browser/extension_icon_image_unittest.cc',
       'browser/extension_pref_value_map_unittest.cc',
       'browser/extension_registry_unittest.cc',
       'browser/file_highlighter_unittest.cc',
       'browser/file_reader_unittest.cc',
@@ skipping 84 matching lines @@
       'renderer/utils_unittest.cc',
       'test/extensions_unittests_main.cc',
       'utility/unpacker_unittest.cc',
     ],
     'extensions_unittests_sources_wifi_display': [
       'renderer/api/display_source/wifi_display/wifi_display_elementary_stream_descriptor_unittest.cc',
       'renderer/api/display_source/wifi_display/wifi_display_media_packetizer_unittest.cc',
     ],
   },
 }