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More histogram owner fixes, as requested by active owners.

Bug: 923083
Change-Id: I235c694827c90f10693bbf04da314fa77ee15023
Reviewed-on: https://chromium-review.googlesource.com/c/1435497Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626135}