This reverts commit f4c14fd9.

Reason for revert: Breaks noi18n build

Original change's description:
> [regexp] implement regexp property sequence proposal
> 
> Also-By: mathias@chromium.org
> Bug: v8:7467
> Change-Id: I9fd6e61f4da1097c2375f671b4801e9730f792c4
> Reviewed-on: https://chromium-review.googlesource.com/1227974
> Commit-Queue: Yang Guo <yangguo@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Mathias Bynens <mathias@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#55991}

TBR=yangguo@chromium.org,jgruber@chromium.org,mathias@chromium.org

Change-Id: I10c67ad3ade35af920d32a7eea8ae0297677fa07
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7467
Reviewed-on: https://chromium-review.googlesource.com/1230137Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55996}