Also remove some unused code.

Bug: v8:6644
Change-Id: Id0021b397f366d2f26e990750c4b8c33f0c1cd81
Reviewed-on: https://chromium-review.googlesource.com/806836Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Georgia Kouveli <georgia.kouveli@arm.com>
Cr-Commit-Position: refs/heads/master@{#49868}