Revert of Change ViEEncoder to not reconfigure the encoder until the video resolution is known. (patchset #4 id:60001 of https://codereview.webrtc.org/2455063002/ )

Reason for revert:
Seems to break WebRTC perf tests.

Original issue's description:
> Change ViEEncoder to not reconfigure the encoder until the video resolution is known.
>
> BUG=b/32285861
>
> Committed: https://crrev.com/461c29e436b5bd7ed019e83024e24dc8e86ec9b9
> Cr-Commit-Position: refs/heads/master@{#14813}

TBR=skvlad@webrtc.org,pbos@webrtc.org,stefan@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=b/32285861

Review-Url: https://codereview.webrtc.org/2457083002
Cr-Original-Commit-Position: refs/heads/master@{#14815}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 5da65f241c79c341b518db6868379835f0e24f0f
5 files changed