Revert 200603 "Make Windows traversal checking handle pathologic..."

trunk/src/base/files/file_path.cc

 // Copyright (c) 2012 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/files/file_path.h"
 
 #include <string.h>
 #include <algorithm>
 
 #include "base/basictypes.h"
@@ skipping 535 matching lines @@
   return new_path;
 }
 
 bool FilePath::ReferencesParent() const {
   std::vector<StringType> components;
   GetComponents(&components);
 
   std::vector<StringType>::const_iterator it = components.begin();
   for (; it != components.end(); ++it) {
     const StringType& component = *it;
-    // Windows has odd, undocumented behavior with path components containing
-    // only whitespace and . characters. So, if all we see is . and
-    // whitespace, then we treat any .. sequence as referencing parent.
-    // For simplicity we enforce this on all platforms.
-    if (component.find_first_not_of(FILE_PATH_LITERAL(". \n\r\t")) ==
-            std::string::npos &&
-        component.find(kParentDirectory) != std::string::npos) {
+    if (component == kParentDirectory)
       return true;
-    }
   }
   return false;
 }
 
 #if defined(OS_POSIX)
 // See file_path.h for a discussion of the encoding of paths on POSIX
 // platforms.  These encoding conversion functions are not quite correct.
 
 string16 FilePath::LossyDisplayName() const {
   return WideToUTF16(SysNativeMBToWide(path_));
@@ skipping 701 matching lines @@
 #else
   return *this;
 #endif
 }
 
 }  // namespace base
 
 void PrintTo(const base::FilePath& path, std::ostream* out) {
   *out << path.value();
 }