Remove FP iterators.

No functional change, just code simplification.

Change-Id: Ie67d515195c462a57954256f045797c3a906d6a4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/435877
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
10 files changed