Disable normal default extensions in case of managed users

chrome/common/chrome_paths.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_COMMON_CHROME_PATHS_H__
 #define CHROME_COMMON_CHROME_PATHS_H__
 
 #include "build/build_config.h"
 
 // This file declares path keys for the chrome module.  These can be used with
@@ skipping 87 matching lines @@
 #if defined(OS_CHROMEOS)
   DIR_CHROMEOS_WALLPAPERS,      // Directory where downloaded chromeos
                                 // wallpapers reside.
   DIR_CHROMEOS_WALLPAPER_THUMBNAILS,  // Directory where downloaded chromeos
                                       // wallpaper thumbnails reside.
   DIR_CHROMEOS_CUSTOM_WALLPAPERS,     // Directory where custom wallpapers
                                       // reside.
   FILE_DEFAULT_APP_ORDER,       // Full path to the json file that defines the
                                 // default app order.
 #endif
+#if defined(ENABLE_MANAGED_USERS)
+  DIR_MANAGED_USERS_DEFAULT_APPS,  // Directory where installer places .crx
+                                   // files to be installed when managed user
+                                   // session starts.
+#endif
 
   // Valid only in development environment; TODO(darin): move these
   DIR_GEN_TEST_DATA,            // Directory where generated test data resides.
   DIR_TEST_DATA,                // Directory where unit test data resides.
   DIR_TEST_TOOLS,               // Directory where unit test tools reside.
 
   PATH_END
 };
 
 // Call once to register the provider for the path keys defined above.
 void RegisterPathProvider();
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_CHROME_PATHS_H__