Remove unused field, and use official size.

TBR=reed@google.com

Change-Id: I15fd225651142eefb0eb94a4f1dde55b13abe0aa
Reviewed-on: https://skia-review.googlesource.com/8343
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Herb Derby <herb@google.com>
1 file changed