Remove histogram introduced by a bad merge

Change-Id: Idd14116e53587b4eac5cb9bf417096417dddb428
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5613290


Commit-Queue: Yoav Weiss (@Shopify) <yoavweiss@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1312813}