Remove SkMakeSpan

Change-Id: I33121076bac3ceca19c81ff9fb47e4b024a14230
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/549838
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Herb Derby <herb@google.com>
59 files changed