Remove unused struct.

TBR=mtklein@google.com

Change-Id: Iad5cda6bc9b9728ade249e8e88ae830798955a3e
Reviewed-on: https://skia-review.googlesource.com/7339
Reviewed-by: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Herb Derby <herb@google.com>
1 file changed