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ExtensionService::RecordPermissionMessagesHistogram() historically used
some bespoke logging because it had custom names for the histograms -
which weren't supported with histogram macros. With histogram functions,
this is much easier, and we can avoid using the internal histogram
logging mechanisms.

Bug: None
Change-Id: I9e35569138094b98e4dab32cfcad505735549666
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2231439Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775185}