def _is_chrome_only_build(revision_to_bot_name):
  """Figures out if a revision-to-bot-name mapping represents a Chrome build.

  We assume here that Chrome revisions are always > 100000, whereas WebRTC
  revisions will not reach that number in the foreseeable future.
  """
  revision = int(revision_to_bot_name.split('--')[0])
  bot_name = revision_to_bot_name.split('--')[1]
  return 'Chrome' in bot_name and revision > 100000