roll_webrtc.py: Fix syntax error for extra trybots line.

tools/roll_webrtc.py

 #!/usr/bin/env python
 # 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 argparse
 import collections
 import logging
 import os
 import re
@@ skipping 21 matching lines @@
 RIETVELD_URL_RE = re.compile('^https?://(.*)/(.*)')
 ROLL_BRANCH_NAME = 'special_webrtc_roll_branch'
 TRYJOB_STATUS_SLEEP_SECONDS = 30
 
 # Use a shell for subcommands on Windows to get a PATH search.
 IS_WIN = sys.platform.startswith('win')
 WEBRTC_PATH = os.path.join('third_party', 'webrtc')
 LIBJINGLE_PATH = os.path.join('third_party', 'libjingle', 'source', 'talk')
 LIBJINGLE_README = os.path.join('third_party', 'libjingle', 'README.chromium')
 # Run these CQ trybots in addition to the default ones in infra/config/cq.cfg.
-EXTRA_TRYBOTS = ('tryserver.chromium.linux:linux_chromium_archive_rel_ng,'
+EXTRA_TRYBOTS = ('tryserver.chromium.linux:linux_chromium_archive_rel_ng;'
                  'tryserver.chromium.mac:mac_chromium_archive_rel_ng')
 
 # Result codes from build/third_party/buildbot_8_4p1/buildbot/status/results.py
 # plus the -1 code which is used when there's no result yet.
 TRYJOB_STATUS = {
   -1: 'RUNNING',
   0: 'SUCCESS',
   1: 'WARNINGS',
   2: 'FAILURE',
   3: 'SKIPPED',
@@ skipping 384 matching lines @@
   if args.abort:
     return autoroller.Abort()
   elif args.wait_for_trybots:
     return autoroller.WaitForTrybots()
   else:
     return autoroller.PrepareRoll(args.dry_run, args.ignore_checks,
                                   args.no_commit, args.close_previous_roll)
 
 if __name__ == '__main__':
   sys.exit(main())