Going to rework this in favor of a sparse histogram.

BUG=477701

This reverts commit c5146c76.

Change-Id: I88ba7b461a1de04324a6ebe164037ea9081f2239
Reviewed-on: https://chromium-review.googlesource.com/271155Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>