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RTP timestamp was recently added to RTCRtpContributingSource in
the WebRTC specification. This CL reflects that change.

Bug: chromium:965994
Change-Id: Iba76a2b90547e7ca70bb04dd556914c7f36ea3fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1625106
Commit-Queue: Johannes Kron <kron@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Reviewed-by: Florent Castelli <orphis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663005}