Remove unused variables from test

Clang trunk warns about them.

Bug: skia:
Change-Id: Id926145f8310f55d42d03fd9288fcb7b3135a612
Reviewed-on: https://skia-review.googlesource.com/62080
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
1 file changed