867fb5224e1ba6a1c2cd523c005499a93ed61a08

Also refactor packet router to use a map rather than iterate over all rtp modules for each packet sent. BUG=webrtc:4311 Review URL: https://codereview.webrtc.org/1247293002 Cr-Commit-Position: refs/heads/master@{#9670}
Revert of Fix PRESUBMIT.py after disabling CQ. (patchset #1 id:1 of https://codereview.webrtc.org/1192673003/)
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