This class was stateless, other than the frozen-for-testing field, which
has been moved to the NativeModule.

R=clemensh@chromium.org

Change-Id: I68ff2b455a62915904aa4b61710b40e679414c3a
Reviewed-on: https://chromium-review.googlesource.com/999536
Commit-Queue: Ben Titzer <titzer@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52499}