It's now unused.

BUG=v8:7308

Change-Id: I301b83fde1d941d5d535922a1174d017186b82ce
Reviewed-on: https://chromium-review.googlesource.com/1169017Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55020}