The implementation of the method is long gone, just the declaration was
left for some reason.

Bug: v8:9183
Change-Id: Id68fc6afa63c3663769f9d8e0a6bc1a7a3aa5e35
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1601497
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61361}