Remove clutter from experimental

SkMatrix has the canonical version of setPolyToPoly, we don't need three
other copies sitting around.

SkBorder appears to be useless.

Bug: skia:
Change-Id: Ie747ff7af6cf1d03e6276e8d7fe57e9b3e4ad411
Reviewed-on: https://skia-review.googlesource.com/74141
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
7 files changed