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This is required otherwise the second include in any component will
trigger multiply defined symbol errors.

BUG=708303

Change-Id: I857cb001f3310a4c35e24768e0fbbd25d6ec22a3
Reviewed-on: https://chromium-review.googlesource.com/531802Reviewed-by: Scott Graham <scottmg@chromium.org>
Commit-Queue: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478773}