Reason for revert:
Breaks build bots.
Original issue's description:
> Save width/height of SPS nalus and restore them on the first packet of an IDR.
>
> It appears that for some H264 streams that the width/height is not set for
> the first packet of the IDR but in the packet containing the SPS/PPS.
>
> BUG=chromium:698088, webrtc:7139
>
> Review-Url: https://codereview.webrtc.org/2750633003
> Cr-Commit-Position: refs/heads/master@{#17239}
> Committed: 620d75f5beTBR=stefan@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:698088, webrtc:7139
Review-Url: https://codereview.webrtc.org/2754543005
Cr-Commit-Position: refs/heads/master@{#17250}
be35a008ef