Move extension_test_message_listener to extensions.

chrome/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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//components/nacl/nacl_defines.gni")
 # //build/config/android/rules.gni imports //tools/grit/grit_rule.gni, which
 # produces a conflict for the "grit" template so we have to only include one.
@@ skipping 874 matching lines @@
       "drive/dummy_drive_service.cc",
       "drive/dummy_drive_service.h",
       "drive/fake_drive_service.cc",
       "drive/fake_drive_service.h",
       "drive/test_util.cc",
       "drive/test_util.h",
       "extensions/api/messaging/native_messaging_test_util.cc",
       "extensions/api/messaging/native_messaging_test_util.h",
       "extensions/extension_notification_observer.cc",
       "extensions/extension_notification_observer.h",
-      "extensions/extension_test_message_listener.cc",
-      "extensions/extension_test_message_listener.h",
       "extensions/mock_extension_special_storage_policy.cc",
       "extensions/mock_extension_special_storage_policy.h",
       "extensions/test_blacklist.cc",
       "extensions/test_blacklist.h",
       "extensions/test_blacklist_state_fetcher.cc",
       "extensions/test_blacklist_state_fetcher.h",
       "extensions/test_extension_environment.cc",
       "extensions/test_extension_environment.h",
       "extensions/test_extension_prefs.cc",
       "extensions/test_extension_prefs.h",
@@ skipping 23 matching lines @@
     ]
   }
 
   if (enable_wifi_bootstrapping) {
     sources += [
       "local_discovery/wifi/mock_wifi_manager.cc",
       "local_discovery/wifi/mock_wifi_manager.h",
     ]
   }
 }