[Findit] Fixed a bug where blame information is not correctly filtered

tools/findit/match_set.py

-# Copyright 2014 The Chromium Authors. All rights reserved.
+# Copyright (c) 2014 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.
 
 import logging
 import re
 
 from threading import Lock
 
 import crash_utils
 
@@ skipping 107 matching lines @@
     self.codereview_api_url = codereview_api_url
     self.matches = {}
     self.cls_to_ignore = set()
     self.matches_lock = Lock()
 
   def RemoveRevertedCLs(self):
     """Removes CLs that are revert."""
     for cl in self.matches:
       if cl in self.cls_to_ignore:
         del self.matches[cl]