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A trailing "}" was not included in the include guard so if
included multiple time, you would get "extraneous }" errors.

Change-Id: I32582e928220ee9428acbefa9a4833d9d36d2eec
Reviewed-on: https://chromium-review.googlesource.com/888581Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#532172}