Reason for revert:
This depends on another CL that has been reverted.
Original issue's description:
> Update build_ios_libs.py to new GN target names.
>
> TBR=kjellander@webrtc.org
> NOTRY=true
> BUG=None
>
> Review-Url: https://codereview.webrtc.org/2888903002
> Cr-Commit-Position: refs/heads/master@{#18175}
> Committed: c3f110a1f9
TBR=
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None
Review-Url: https://codereview.webrtc.org/2886873007
Cr-Commit-Position: refs/heads/master@{#18183}