Pulling user experiment code from BrowserDistribution to a new class.

chrome/chrome_installer_util.gypi

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       'installer_util_target': 0,
     },
     'target_conditions': [
@@ skipping 61 matching lines @@
           'installer/util/master_preferences_constants.cc',
           'installer/util/master_preferences_constants.h',
           'installer/util/move_tree_work_item.cc',
           'installer/util/move_tree_work_item.h',
           'installer/util/registry_key_backup.cc',
           'installer/util/registry_key_backup.h',
           'installer/util/self_reg_work_item.cc',
           'installer/util/self_reg_work_item.h',
           'installer/util/set_reg_value_work_item.cc',
           'installer/util/set_reg_value_work_item.h',
+          'installer/util/user_experiment.cc',
+          'installer/util/user_experiment.h',
           'installer/util/util_constants.cc',
           'installer/util/util_constants.h',
           'installer/util/wmi.cc',
           'installer/util/wmi.h',
           'installer/util/work_item.cc',
           'installer/util/work_item.h',
           'installer/util/work_item_list.cc',
           'installer/util/work_item_list.h',
         ],
         'include_dirs': [
@@ skipping 127 matching lines @@
               'sources': [ '../content/public/common/content_switches.cc' ],
               'defines': [ 'COMPILE_CONTENT_STATICALLY'],
             }],
           ],
         }
       ],
     }],
 
   ],
 }