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Histograms that are also recorded in UKM are only made local for ease of
continued testing. The other histograms are removed in code.

Bug: 1165102
Change-Id: Ie2eefc8cfaea777a7b381b11f667c85dd694ab44
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622429Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843611}