[Telemetry + tools/perf] Modify the pylint disable message to use symbolic name

tools/perf/profile_creators/profile_generator_unittest.py

 # Copyright 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 os
 import shutil
 import socket
 import tempfile
 import unittest
 
@@ skipping 37 matching lines @@
       socket_filename = os.path.join(sandbox_directory, 'named_socket')
       the_socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
       the_socket.bind(socket_filename)
 
   def testIsPseudoFile(self):
     sandbox_dir = os.path.join(self.test_directory, "sandbox")
     self._CreateFunkyFilesAndOnePlainFile(sandbox_dir)
 
     # If we can copy the directory, we're golden!
     sandbox_dir_copy = os.path.join(self.test_directory, "sandbox_copy")
-    # pylint: disable=W0212
+    # pylint: disable=protected-access
     shutil.copytree(sandbox_dir, sandbox_dir_copy,
         ignore=profile_generator._IsPseudoFile)
 
     # Check that only the directory and plain file got copied.
     dir_contents = os.listdir(sandbox_dir_copy)
     dir_contents.sort()
     self.assertEqual(['directory', 'plain_file'], dir_contents)
 
   def tearDown(self):
     shutil.rmtree(self.test_directory)