This reverts commit 30729e82.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> [Intl] Move Intl.getCanonicalLocales to C++
> 
> Bug: v8:5751
> Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
> Change-Id: I20dc0e7eda58f2d9211d0e569d553dd6fcc14fd3
> Reviewed-on: https://chromium-review.googlesource.com/c/1275807
> Commit-Queue: Frank Tang <ftang@chromium.org>
> Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#56747}

TBR=jshin@chromium.org,gsathya@chromium.org,ftang@chromium.org

Change-Id: I236e183288f0546b8bbdca4804a1d02421c8c714
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:5751
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/c/1286955Reviewed-by: Frank Tang <ftang@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56749}