Add FilePath to base namespace.

chrome/installer/util/duplicate_tree_detector.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.
 //
 // This file declares a helper function that will check to see if a given folder
 // is "identical" to another (for some value of identical, see below).
 //
 
 #ifndef CHROME_INSTALLER_UTIL_DUPLICATE_TREE_DETECTOR_H_
 #define CHROME_INSTALLER_UTIL_DUPLICATE_TREE_DETECTOR_H_
 
+namespace base {
 class FilePath;
+}
 
 namespace installer {
 
 // Returns true if |dest_path| contains all the files from |src_path| in the
 // same directory structure and each of those files is of the same length.
 // src_path_ and |dest_path| must either both be files or both be directories.
 // Note that THIS IS A WEAK DEFINITION OF IDENTICAL and is intended only to
 // catch cases of missing files or obvious modifications.
 // It notably DOES NOT CHECKSUM the files.
-bool IsIdenticalFileHierarchy(const FilePath& src_path,
-                              const FilePath& dest_path);
+bool IsIdenticalFileHierarchy(const base::FilePath& src_path,
+                              const base::FilePath& dest_path);
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_DUPLICATE_TREE_DETECTOR_H_