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In jumbo/unity builds it conflicts with syncer::WriteTransaction defined
in components/sync/syncable/write_transaction.h.

Change-Id: I19a325af6299d955577aec10d36f21b948859035
Reviewed-on: https://chromium-review.googlesource.com/822091Reviewed-by: Pavel Yatsuk <pavely@chromium.org>
Commit-Queue: Jens Widell <jl@opera.com>
Cr-Commit-Position: refs/heads/master@{#523502}