message: Update roll_deps.py to use main branch
  No-Presubmit: True
  No-Tree-Checks: True
  Cr-Commit-Position: refs/heads/master@{#34376}
diff: @@ -568,16 +568,16 @@ def _IsTreeClean():
  return False
  -def _EnsureUpdatedMasterBranch(dry_run):
  +def _EnsureUpdatedMainBranch(dry_run):
  current_branch = _RunCommand(['git', 'rev-parse', '--abbrev-ref',
  'HEAD'])[0].splitlines()[0]
  - if current_branch != 'master':
  + if current_branch != 'main':
  logging.error(
  - 'Please checkout the master branch and re-run this script.')
  + 'Please checkout the main branch and re-run this script.')
  if not dry_run:
  sys.exit(-1)
  - logging.info('Updating master branch...')
  + logging.info('Updating main branch...')
  _RunCommand(['git', 'pull'])
  @@ -590,7 +590,7 @@ def _CreateRollBranch(dry_run):
  def _RemovePreviousRollBranch(dry_run):
  active_branch, branches = _GetBranches()
  if active_branch == ROLL_BRANCH_NAME:
  - active_branch = 'master'
  + active_branch = 'main'
  if ROLL_BRANCH_NAME in branches:
  logging.info('Removing previous roll branch (%s)', ROLL_BRANCH_NAME)
  if not dry_run:
  @@ -672,7 +672,7 @@ def main():
  '--ignore-unclean-workdir',
  action='store_true',
  default=False,
  - help=('Ignore if the current branch is not master or if there '
  + help=('Ignore if the current branch is not main or if there '
  'are uncommitted changes (default: %(default)s).'))
  grp = p.add_mutually_exclusive_group()
  grp.add_argument(
  @@ -705,7 +705,7 @@ def main():
  _RemovePreviousRollBranch(opts.dry_run)
  if not opts.ignore_unclean_workdir:
  - _EnsureUpdatedMasterBranch(opts.dry_run)
  + _EnsureUpdatedMainBranch(opts.dry_run)
  deps_filename = os.path.join(CHECKOUT_SRC_DIR, 'DEPS')
  webrtc_deps = ParseLocalDepsFile(deps_filename)
  