Allow extensions to specify that they are not allowed in incognito mode.

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/dns/dns_apitest.cc',
@@ skipping 106 matching lines @@
       'common/features/base_feature_provider_unittest.cc',
       'common/features/complex_feature_unittest.cc',
       'common/features/simple_feature_unittest.cc',
       'common/file_util_unittest.cc',
       'common/image_util_unittest.cc',
       'common/manifest_handler_unittest.cc',
       'common/manifest_handlers/content_capabilities_manifest_unittest.cc',
       'common/manifest_handlers/default_locale_manifest_unittest.cc',
       'common/manifest_handlers/externally_connectable_unittest.cc',
       'common/manifest_handlers/file_handler_manifest_unittest.cc',
+      'common/manifest_handlers/incognito_manifest_unittest.cc',
       'common/manifest_handlers/kiosk_mode_info_unittest.cc',
       'common/manifest_handlers/oauth2_manifest_unittest.cc',
       'common/manifest_handlers/shared_module_manifest_unittest.cc',
       'common/message_bundle_unittest.cc',
       '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',
@@ skipping 23 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',
     ],
   },
 }