message: Add hta@ to rtc_base/ and api/ WATCHLISTS.
  No-Try: True
  Cr-Commit-Position: refs/heads/master@{#32911}
diff: 'peah@webrtc.org',
  'saza@webrtc.org'],
  'audio': ['peah@webrtc.org'],
  - 'api': ['peah@webrtc.org'],
  - 'base': [],
  + 'api': ['hta@webrtc.org',
  + 'peah@webrtc.org'],
  + 'base': ['hta@webrtc.org'],
  'call': ['mflodman@webrtc.org',
  'stefan@webrtc.org'],
  'video': ['mflodman@webrtc.org',
  