Enable presubmit pylint in build/android.

build/android/tombstones.py

 #!/usr/bin/env python
 #
 # 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.
 #
 # Find the most recent tombstone file(s) on all connected devices
 # and prints their stacks.
 #
 # Assumes tombstone file was created with current symbols.
 
 import datetime
-import logging
 import multiprocessing
 import os
 import subprocess
 import sys
 import optparse
 
 from pylib import android_commands
 
 
 def _ListTombstones(adb):
@@ skipping 146 matching lines @@
                     help="""Resolve symbols for all tombstones, rather than just
                          the most recent""")
   parser.add_option('-s', '--stack', action='store_true',
                     help='Also include symbols for stack data')
   parser.add_option('-w', '--wipe-tombstones', action='store_true',
                     help='Erase all tombstones from device after processing')
   parser.add_option('-j', '--jobs', type='int',
                     default=4,
                     help='Number of jobs to use when processing multiple '
                          'crash stacks.')
-  options, args = parser.parse_args()
+  options, _ = parser.parse_args()
 
   if options.device:
     devices = [options.device]
   else:
     devices = android_commands.GetAttachedDevices()
 
   tombstones = []
   for device in devices:
     adb = android_commands.AndroidCommands(device)
     tombstones += _GetTombstonesForDevice(adb, options)
 
   _ResolveTombstones(options.jobs, tombstones)
 
 if __name__ == '__main__':
   sys.exit(main())