remove unimplemented headers

implementation never done

R=reed@google.com,djsollen@google.com

Bug: b:111664728
Change-Id: I2f28f8770af5260a32bb655fffc0f467086f6896
Reviewed-on: https://skia-review.googlesource.com/142688
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Cary Clark <caryclark@google.com>
1 file changed