Reason for revert:
This CL broke some buildbots. I will investigate it later.
Original issue's description:
> Refactor webrtc/modules/video_processing for GN check
>
> This moves some GN check configurations out of .gn to individual
> targets.
>
> The now checked target is:
> "//webrtc/modules/video_processing/*"
>
> BUG=webrtc:6828
> NOTRY=True
>
> Review-Url: https://codereview.webrtc.org/2595543002
> Cr-Commit-Position: refs/heads/master@{#15732}
> Committed: 00a810b844
TBR=kjellander@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:6828
Review-Url: https://codereview.webrtc.org/2594973002
Cr-Commit-Position: refs/heads/master@{#15733}