This completes refactoring started in 0a355777.

Bug: v8:6474
Change-Id: Ia2ea66e10e4f1d55551fe145f67f4021ae254b23
Reviewed-on: https://chromium-review.googlesource.com/532997
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45934}