This method only has a single user, and can be implemented in a few
lines, so just inline it.

R=ahaas@chromium.org

Bug: v8:8015
Change-Id: I26247d97ebb939274fa72cc5441e8c2e0c6bc869
Reviewed-on: https://chromium-review.googlesource.com/1245743Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56239}