Change logging statements to not use the "%" operator.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/flaky_tests.py

 # Copyright (c) 2011 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 65 matching lines @@
         models = []
         for builder_name in builder_names:
             model = TestExpectationsModel()
             models.append(model)
 
             expectations = factory.expectations_for_builder(builder_name)
 
             # TODO(ojan): We should also skip bots that haven't uploaded recently,
             # e.g. if they're >24h stale.
             if not expectations:
-                _log.error("Can't load flakiness data for builder: %s" % builder_name)
+                _log.error("Can't load flakiness data for builder: %s", builder_name)
                 continue
 
             for line in expectations.expectation_lines(only_ignore_very_flaky=True):
                 # TODO(ojan): Find a way to merge specifiers instead of removing build types.
                 # We can't just union because some specifiers will change the meaning of others.
                 # For example, it's not clear how to merge [ Mac Release ] with [ Linux Debug ].
                 # But, in theory we should be able to merge [ Mac Release ] and [ Mac Debug ].
                 line.specifiers = self._filter_build_type_specifiers(line.specifiers)
                 model.add_expectation_line(line)
 
@@ skipping 13 matching lines @@
         port = tool.port_factory.get()
         # Skip any tests which are mentioned in the dashboard but not in our checkout:
         fs = tool.filesystem
         lines = [line for line in lines if fs.exists(fs.join(port.layout_tests_dir(), line.path))]
 
         test_names = [line.name for line in lines]
         flakiness_dashboard_url = self.FLAKINESS_DASHBOARD_URL % ','.join(test_names)
         expectations_string = TestExpectations.list_to_string(lines)
 
         print self.OUTPUT % (self.HEADER, expectations_string, flakiness_dashboard_url)