UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36

Steps to reproduce the problem:
1. Using headless ubuntu build chromium headless
2. Attempt to browse page with --remote-debugging-port={port number}
3. Error will be thrown

What is the expected behavior?
chromium headless should be able to launch in a headless environment

What went wrong?
ubuntu@ip-172-31-57-15:~/chromium$ src/out/Debug/headless_shell --remote-debugging-port=9222 http://goat.com
[0808/193915:INFO:fake_audio_manager.cc(23)] FakeAudioManager
[0808/193915:ERROR:socket_posix.cc(125)] bind() returned an error, errno=98: Address already in use
[0808/193915:ERROR:devtools_http_handler.cc(228)] Cannot start http server for devtools. Stop devtools.
[0808/193915:WARNING:webmediaplayer_impl.cc(360)] Using MultibufferDataSource
[0808/193916:ERROR:ffmpeg_demuxer.cc(1595)] OnReadFrameDone result=-541478725 IsMaxMemoryUsageReached=0

Did this work before? No 

Chrome version: 52.0.2743.82  Channel: n/a
OS Version: OS X 10.11.5
Flash Version: Shockwave Flash 22.0 r0