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This CL is removing useless forward declaration and unused include file.

There is no behavior change.

R=robliao@chromium.org, asvitkine@chromium.org
CC=​benck@google.com

Bug: 944227
Change-Id: Ifcda56f000119dd3682eff2e7665f59a49c84ed1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1643381Reviewed-by: Robert Liao <robliao@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666282}