SkUtils:  remove some versions of UTF routines.

Change-Id: Ib1f776ae472117c23d2145253adf25fceb412b32
Reviewed-on: https://skia-review.googlesource.com/143111
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
15 files changed