This timer imposes a high overhead and does not give us the data we'd
like. Disabling for now until we can develop a better solution.

Bug: v8:6514
Change-Id: I73b15131a71d7b6750556f82907cb2a0e6edd321
Reviewed-on: https://chromium-review.googlesource.com/633703
Commit-Queue: Brad Nelson <bradnelson@chromium.org>
Reviewed-by: Brad Nelson <bradnelson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47582}