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

base/file_path.cc

 // Copyright (c) 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.
 
 #include "base/file_path.h"
 #include "base/logging.h"
 
 // These includes are just for the *Hack functions, and should be removed
 // when those functions are removed.
 #include "base/string_piece.h"
@@ skipping 434 matching lines @@
        --pos) {
     // If the string only has two separators and they're at the beginning,
     // don't strip them, unless the string began with more than two separators.
     if (pos != start + 1 || last_stripped == start + 2 ||
         !IsSeparator(path_[start - 1])) {
       path_.resize(pos - 1);
       last_stripped = pos;
     }
   }
 }
+
+bool FilePath::ReferencesParent() const {
+  std::vector<FilePath::StringType> components;
+  GetComponents(&components);
+
+  std::vector<FilePath::StringType>::const_iterator it = components.begin();
+  for (; it != components.end(); ++it) {
+    const FilePath::StringType& component = *it;
+    if (component == kParentDirectory)
+      return true;
+  }
+  return false;
+}
+