Reason for revert:
This should wait until https://chromium-review.googlesource.com/c/558980/ is submitted.
Original issue's description:
> Remove webrtc/tools
>
> BUG=webrtc:7855
> TBR=kwiberg@webrtc.org
>
> Review-Url: https://codereview.webrtc.org/2970743003
> Cr-Commit-Position: refs/heads/master@{#18883}
> Committed: ed56680adb
TBR=mbonadei@webrtc.org,kwiberg@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7855
Review-Url: https://codereview.webrtc.org/2973493002
Cr-Commit-Position: refs/heads/master@{#18885}