A follow-up nit fix for jumplist file operations

base/files/file_util_posix.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_util.h"
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <libgen.h>
@@ skipping 258 matching lines @@
     if (real_to_path.empty())
       return false;
   } else {
     real_to_path = MakeAbsoluteFilePath(real_to_path.DirName());
     if (real_to_path.empty())
       return false;
   }
   FilePath real_from_path = MakeAbsoluteFilePath(from_path);
   if (real_from_path.empty())
     return false;
-  if (real_to_path.value().size() >= real_from_path.value().size() &&
-      real_to_path.value().compare(0, real_from_path.value().size(),
-                                   real_from_path.value()) == 0) {
+  if (real_to_path == real_from_path || real_from_path.IsParent(real_to_path))
     return false;
-  }
 
   int traverse_type = FileEnumerator::FILES | FileEnumerator::SHOW_SYM_LINKS;
   if (recursive)
     traverse_type |= FileEnumerator::DIRECTORIES;
   FileEnumerator traversal(from_path, recursive, traverse_type);
 
   // We have to mimic windows behavior here. |to_path| may not exist yet,
   // start the loop with |to_path|.
   struct stat from_stat;
   FilePath current = from_path;
@@ skipping 691 matching lines @@
     return false;
 
   DeleteFile(from_path, true);
   return true;
 }
 
 }  // namespace internal
 
 #endif  // !defined(OS_NACL_NONSFI)
 }  // namespace base