Move shell_util's RegistryEntry class into a separate file.

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 143 matching lines @@
             'installer/util/installation_validator.h',
             'installer/util/logging_installer.cc',
             'installer/util/logging_installer.h',
             'installer/util/lzma_util.cc',
             'installer/util/lzma_util.h',
             'installer/util/master_preferences.cc',
             'installer/util/master_preferences.h',
             'installer/util/product.h',
             'installer/util/product.cc',
             'installer/util/product_operations.h',
+            'installer/util/registry_entry.cc',
+            'installer/util/registry_entry.h',
             'installer/util/self_cleaning_temp_dir.cc',
             'installer/util/self_cleaning_temp_dir.h',
             'installer/util/shell_util.cc',
             'installer/util/shell_util.h',
             'installer/util/uninstall_metrics.cc',
             'installer/util/uninstall_metrics.h',
             'installer/util/user_experiment.cc',
             'installer/util/user_experiment.h',
           ],
           # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
@@ skipping 54 matching lines @@
           ],
           'include_dirs': [
             '<(DEPTH)',
           ],
         }
       ],
     }],
 
   ],
 }