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This avoids collisions in jumbo/unity builds.

Change-Id: Ibd47b3c0be950c6f9fb5baf206612203c99e9b35
Reviewed-on: https://chromium-review.googlesource.com/827132Reviewed-by: Pavel Yatsuk <pavely@chromium.org>
Commit-Queue: Jens Widell <jl@opera.com>
Cr-Commit-Position: refs/heads/master@{#524351}