remove unused variable

Bug: skia:
Change-Id: I0300d5c0b616ed87426aa7329491cf1d2b8c58f2
Reviewed-on: https://skia-review.googlesource.com/c/192107
Reviewed-by: Nigel Tao <nigeltao@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed