[iOS/GN] Fix compilation of ios_chrome_unittests with gn.

ios/net/BUILD.gn

 # 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.
 
 import("//testing/test.gni")
 
 source_set("net") {
   deps = [
     "//base",
     "//net",
@@ skipping 19 matching lines @@
     "cookies/system_cookie_util.mm",
     "crn_http_protocol_handler.h",
     "crn_http_protocol_handler.mm",
     "crn_http_protocol_handler_proxy.h",
     "crn_http_protocol_handler_proxy_with_client_thread.h",
     "crn_http_protocol_handler_proxy_with_client_thread.mm",
     "crn_http_url_response.h",
     "crn_http_url_response.mm",
     "empty_nsurlcache.h",
     "empty_nsurlcache.mm",
+    "http_cache_helper.cc",
+    "http_cache_helper.h",
     "http_protocol_logging.h",
     "http_protocol_logging.mm",
     "http_response_headers_util.h",
     "http_response_headers_util.mm",
     "nsurlrequest_util.h",
     "nsurlrequest_util.mm",
     "protocol_handler_util.h",
     "protocol_handler_util.mm",
     "request_tracker.h",
     "request_tracker.mm",
@@ skipping 17 matching lines @@
     "cookies/cookie_cache_unittest.cc",
     "cookies/cookie_creation_time_manager_unittest.mm",
     "cookies/cookie_store_ios_unittest.mm",
     "cookies/system_cookie_util_unittest.mm",
     "http_response_headers_util_unittest.mm",
     "nsurlrequest_util_unittest.mm",
     "protocol_handler_util_unittest.mm",
     "url_scheme_util_unittest.mm",
   ]
 }