Add "bool FilePath::ReferencesParent()" which adds a clean & simple way for...

base/file_path.h

Index: base/file_path.h
===================================================================
--- base/file_path.h	(revision 23136)
+++ base/file_path.h	(working copy)
@@ -224,6 +224,10 @@
   // separator.
   FilePath StripTrailingSeparators() const;
 
+  // Returns true if this FilePath contains any attempt to reference a parent
+  // directory (i.e. has a path component that is ".."
+  bool ReferencesParent() const;
+
   // Older Chromium code assumes that paths are always wstrings.
   // This function converts a wstring to a FilePath, and is useful to smooth
   // porting that old code to the FilePath API.