Enable old-style-class lint check for telemetry & perf.

tools/perf/metrics/webrtc_stats_unittest.py

 # Copyright 2013 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 unittest
 
 from telemetry.unittest_util import simple_mock
 
 from metrics import webrtc_stats
 
@@ skipping 69 matching lines @@
       {
           "googAvailableSendBandwidth":"40000",
           "googAvailableRecvBandwidth":"22345",
           "googTargetEncBitrate":"20000"
       }
   ]
 ]]
 '''
 
 
-class FakeResults:
+class FakeResults(object):
   def __init__(self, current_page):
     self._received_values = []
     self._current_page = current_page
 
   @property
   def received_values(self):
     return self._received_values
 
   @property
   def current_page(self):
@@ skipping 53 matching lines @@
     # from video reports (even though audio_input_level is quite obvious).
     self.assertNotIn('peer_connection_0_audio_audio_input_level', all_names,
                      'Input level is in the JSON for both connections but '
                      'should not be reported since it is not interesting.')
     self.assertNotIn('peer_connection_1_audio_audio_input_level', all_names)
 
   def testReturnsIfJsonIsEmpty(self):
     results = self._RunMetricOnJson('[]')
     self.assertFalse(results.received_values)