Use rvalue reference instead of ExtensionBuilder::pass()

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 122 matching lines @@
       'common/one_shot_event_unittest.cc',
       'common/permissions/api_permission_set_unittest.cc',
       'common/permissions/manifest_permission_set_unittest.cc',
       'common/permissions/socket_permission_unittest.cc',
       'common/permissions/usb_device_permission_unittest.cc',
       'common/stack_frame_unittest.cc',
       'common/url_pattern_set_unittest.cc',
       'common/url_pattern_unittest.cc',
       'common/update_manifest_unittest.cc',
       'common/user_script_unittest.cc',
+      'common/extension_builder_unittest.cc',
       'common/value_builder_unittest.cc',
       'renderer/activity_log_converter_strategy_unittest.cc',
       'renderer/api/mojo_private/mojo_private_unittest.cc',
       'renderer/api/serial/data_receiver_unittest.cc',
       'renderer/api/serial/data_sender_unittest.cc',
       'renderer/api/serial/serial_api_unittest.cc',
       'renderer/api_test_base.cc',
       'renderer/api_test_base.h',
       'renderer/api_test_base_unittest.cc',
       'renderer/event_unittest.cc',
@@ skipping 10 matching lines @@
       'renderer/scoped_web_frame.h',
       'renderer/script_context_set_unittest.cc',
       'renderer/script_context_unittest.cc',
       'renderer/utils_unittest.cc',
       'shell/browser/shell_web_contents_modal_dialog_manager.cc',
       'test/extensions_unittests_main.cc',
       'utility/unpacker_unittest.cc',
     ],
   },
 }