remove unused device apis

BUG=skia:

Change-Id: I7a6b185a0fbe779e3fa4c135437d4d1fb9b94bd8
Reviewed-on: https://skia-review.googlesource.com/7322
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
4 files changed