Change PolicyLoaderWin to load PReg files if possible.

chrome/browser/policy/policy_path_parser_win.cc

 // Copyright (c) 2011 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.
 
 #include <shlobj.h>
 #include <wtsapi32.h>
 #pragma comment(lib, "wtsapi32.lib")
 
 #include "chrome/browser/policy/policy_path_parser.h"
 
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/utf_string_conversions.h"
 #include "base/win/registry.h"
 #include "chrome/common/chrome_switches.h"
 #include "policy/policy_constants.h"
 
 namespace {
 
 // Checks if the registry key exists in the given hive and expands any
 // variables in the string.
 bool LoadUserDataDirPolicyFromRegistry(HKEY hive,
                                        const std::wstring& key_name,
                                        base::FilePath* user_data_dir) {
   std::wstring value;
 
   base::win::RegKey policy_key(hive,
-                               policy::kRegistryMandatorySubKey,
+                               policy::kRegistryChromePolicyKey,
                                KEY_READ);
   if (policy_key.ReadValue(key_name.c_str(), &value) == ERROR_SUCCESS) {
     *user_data_dir =
         base::FilePath(policy::path_parser::ExpandPathVariables(value));
     return true;
   }
   return false;
 }
 
 const WCHAR* kMachineNamePolicyVarName = L"${machine_name}";
@@ skipping 123 matching lines @@
     // A Group Policy value was loaded.  Append the Chrome Frame host directory
     // if relevant.
     if (is_chrome_frame)
       *user_data_dir = user_data_dir->Append(cf_host_dir);
   }
 }
 
 }  // namespace path_parser
 
 }  // namespace policy