This is currently dead code as intl no longer uses this to reset the
cache. Intl will use a different caching strategy in the future.

Bug: v8:5751
Change-Id: I343fa8afe5069cb7228106b3cd355d004aed199f
Reviewed-on: https://chromium-review.googlesource.com/c/1319766Reviewed-by: Frank Tang <ftang@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57311}