Remove SkTextBox

Change-Id: I697135475fa9c1b7e803500b743f10c3877c1e10
Reviewed-on: https://skia-review.googlesource.com/129560
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Herb Derby <herb@google.com>
5 files changed