Use SkSpan for dehydrated module data.

This code was written before we had spans.

Change-Id: Ic4356dbb2c93a27b4f39e6614a7cd9996e6b144b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/584227
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
16 files changed