Remove all headers from include/gpu/effects

TBR=bsalomon@google.com

Change-Id: I9ad2fa41262693b3a83bef625eac332eb1e71a3d
Reviewed-on: https://skia-review.googlesource.com/13988
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
5 files changed