Make policy errors available to display in about:policy.

chrome/browser/policy/policy_path_parser.h

 // 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.
 
 #ifndef CHROME_BROWSER_POLICY_POLICY_PATH_PARSER_H_
 #define CHROME_BROWSER_POLICY_POLICY_PATH_PARSER_H_
+#pragma once
 
 #include <string>
 
 #include "base/file_path.h"
 
 namespace policy {
 
 namespace path_parser {
 
 // This function is used to expand the variables in policy strings that
@@ skipping 30 matching lines @@
 // translated only once in every string because for most of these there is no
 // sense in concatenating them more than once in a single path.
 FilePath::StringType ExpandPathVariables(
     const FilePath::StringType& untranslated_string);
 
 }  // namespace path_parser
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_POLICY_PATH_PARSER_H_