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It is only used to printf to a FILE*, which <cstdio> already does.

Change-Id: I05965cafca27d918858716ed624358a506119b96
Reviewed-on: https://chromium-review.googlesource.com/965383Reviewed-by: Yuta Kitamura <yutak@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543694}