Remove declaration of SkTextureImageSetTexture, which does not exist

Bug: skia:
Change-Id: Ifb7edcae491ef48fbc69324d9dfb97a298104db9
Reviewed-on: https://skia-review.googlesource.com/15073
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed