Fix clang warning about unused lambda capture.


This was found by a tip of tree build of clang.

Change-Id: I9aa3fecd47ae69350e8d58e796f960a991b7759e
Reviewed-on: https://skia-review.googlesource.com/7586
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
1 file changed