Gcc complains about an unused variable.
Adjust a #include to work with the gyp build.

BUG=none

Change-Id: Ia94abf70f3a9bb7952eb53d1f0a3cfcca5df0836
Reviewed-on: https://chromium-review.googlesource.com/867655Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Frank Henigman <fjhenigman@chromium.org>