Reland "hide unused var"

This is a reland of 746db42e2c07050d5d0a0db11bfdab441d57e8cd
Original change's description:
> hide unused var
> 
> Bug: skia:
> Change-Id: Ia060e0becd8d40817c59e2918678dbdc6dfd6cdd
> Reviewed-on: https://skia-review.googlesource.com/86041
> Reviewed-by: Mike Reed <reed@google.com>

Bug: skia:
Change-Id: I610ccfec1e1eb7888bd4f16f7d83fded10ccf0af
Reviewed-on: https://skia-review.googlesource.com/87720
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed