tools: Remove reference to svndiff.

tools/jsondiff.py

 #!/usr/bin/python
 
 '''
 Copyright 2013 Google Inc.
 
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 '''
 
 '''
@@ skipping 64 matching lines @@
         be raised.
 
         Any tests for which we have no expectations will be left out of the
         returned dictionary.
         """
         result_dict = {}
         json_dict = gm_json.LoadFromString(contents)
         all_expectations = json_dict[gm_json.JSONKEY_EXPECTEDRESULTS]
 
         # Prevent https://code.google.com/p/skia/issues/detail?id=1588
-        # ('svndiff.py: 'NoneType' object has no attribute 'keys'')
         if not all_expectations:
             return result_dict
 
         for test_name in all_expectations.keys():
             test_expectations = all_expectations[test_name]
             allowed_digests = test_expectations[
                 gm_json.JSONKEY_EXPECTEDRESULTS_ALLOWEDDIGESTS]
             if allowed_digests:
                 num_allowed_digests = len(allowed_digests)
                 if num_allowed_digests > 1:
@@ skipping 96 matching lines @@
         'ACTUAL results from the "old" JSON file. This can be a ' +
         'filepath on local storage, or a URL.')
     args = parser.parse_args()
     differ = GMDiffer()
     diffs = differ.GenerateDiffDict(oldfile=args.old, newfile=args.new)
     json.dump(diffs, sys.stdout, sort_keys=True, indent=2)
 
 
 if __name__ == '__main__':
     _Main()