GitLab

Was previously an OWNER of all histograms.xml before the split. Now
moving to sub-owners of directories I tend to do reviews for.

Bug: None
Change-Id: I34de0dd4f0a17c014e5f1bcdc96046b78483253b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444029
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827142}