Move PathComponents from file_util to FilePath, add FilePath::IsParent()

base/file_util.h

 // Copyright (c) 2006-2008 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 contains utility functions for dealing with the local
 // filesystem.
 
 #ifndef BASE_FILE_UTIL_H_
 #define BASE_FILE_UTIL_H_
 
@@ skipping 20 matching lines @@
 
 namespace base {
 class Time;
 }
 
 namespace file_util {
 
 //-----------------------------------------------------------------------------
 // Functions that operate purely on a path string w/o touching the filesystem:
 
-// Returns a vector of all of the components of the provided path.
-void PathComponents(const FilePath& path,
-                    std::vector<FilePath::StringType>* components);
-
 // Returns true if the given path ends with a path separator character.
 bool EndsWithSeparator(const FilePath& path);
 // These two versions are both deprecated. TODO(estade): remove them.
 bool EndsWithSeparator(std::wstring* path);
 bool EndsWithSeparator(const std::wstring& path);
 
 // Makes sure that |path| ends with a separator IFF path is a directory that
 // exists. Returns true if |path| is an existing directory, false otherwise.
 bool EnsureEndsWithSeparator(FilePath* path);
 
@@ skipping 470 matching lines @@
 
 // Renames a file using the SHFileOperation API to ensure that the target file
 // gets the correct default security descriptor in the new path.
 bool RenameFileAndResetSecurityDescriptor(
     const FilePath& source_file_path,
     const FilePath& target_file_path);
 
 }  // namespace file_util
 
 #endif  // BASE_FILE_UTIL_H_