remove canvas internal private

interfaces not called externally
and aren't used internally

R=robertphillips@google.com,reed@google.com
Bug: skia:6455
Change-Id: Iee98ce4380a28a831d9bffe99932b54421dd339a
Reviewed-on: https://skia-review.googlesource.com/112481
Commit-Queue: Cary Clark <caryclark@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
3 files changed