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Using LazyInstance seems to be discouraged (crbug.com/686866) now that
Chrome supports Thread-safe static initialization.

Change-Id: I7649ad76ada5bd2292341f46fa1955d2ae51385e
BUG: 686866,720131
Reviewed-on: https://chromium-review.googlesource.com/594491Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491100}