Fix iOS build

BUG=skia:

Change-Id: I914cd75c84bbe57401ab65352d4e8b3dc413dce1
Reviewed-on: https://skia-review.googlesource.com/6418
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Matt Sarett <msarett@google.com>
1 file changed