Remove protected-access from tools/perf/pylintrc.

tools/perf/update_reference_build_unittest.py

 # Copyright 2015 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
 import update_reference_build as update_ref_build
 
 
+# Disable for accessing private API of update_reference_build class.
+# pylint: disable=protected-access
 class UpdateReferenceBuildUnittest(unittest.TestCase):
   def testInit(self):
     @classmethod
     def EmptyVersions(_):
       return {}
     @classmethod
     def AllOmahaVersion1(_):
       return {'mac':'1', 'linux':'1', 'win':'1'}
     @classmethod
     def AllCurrentVersion1(_):
@@ skipping 80 matching lines @@
                 '03/03/15', '827a380cfdb31aa54c8d56e63ce2c3fd8c3ba4d4',
                 '310958', 'a4d5695040a99b9b2cb196eb5b898383a274376e', '188177',
                 'master', '4.1.0.21\n']]
       self.assertRaises(ValueError, b._OmahaVersionsMap)
       lines = ['random', 'list', 'of', 'strings']
       self.assertRaises(ValueError, b._OmahaVersionsMap)
       lines = []
       self.assertRaises(ValueError, b._OmahaVersionsMap)
     finally:
       update_ref_build.BuildUpdater._OmahaReport = old_omaha_report