Moved IS_EPHEMERAL flag to extension prefs

extensions/extensions.gyp

 # Copyright 2013 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 348 matching lines @@
         'browser/extension_registry.cc',
         'browser/extension_registry.h',
         'browser/extension_registry_factory.cc',
         'browser/extension_registry_factory.h',
         'browser/extension_registry_observer.h',
         'browser/extension_scoped_prefs.h',
         'browser/extension_system.cc',
         'browser/extension_system.h',
         'browser/extension_system_provider.cc',
         'browser/extension_system_provider.h',
+        'browser/extension_util.cc',
+        'browser/extension_util.h',
         'browser/extension_web_contents_observer.cc',
         'browser/extension_web_contents_observer.h',
         'browser/extensions_browser_client.cc',
         'browser/extensions_browser_client.h',
         'browser/external_provider_interface.h',
         'browser/image_util.cc',
         'browser/image_util.h',
         'browser/info_map.cc',
         'browser/info_map.h',
         'browser/file_highlighter.cc',
@@ skipping 248 matching lines @@
         'test/test_extensions_client.cc',
         'test/test_extensions_client.h',
         'test/test_permission_message_provider.cc',
         'test/test_permission_message_provider.h',
         'test/test_permissions_provider.cc',
         'test/test_permissions_provider.h',
       ],
     },
   ]
 }