Remove GrGLProgram cache stats, remove spurious declarations/includes

Change-Id: I5f3c17fc008a5ec92803000f17d7db65af1b4cfa
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/238901
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed