Remove GrClipsStackClip member from SkGpuDevice

Change-Id: Ibfbfeda86e3d6a819bf198af5c36852744897fb8
Reviewed-on: https://skia-review.googlesource.com/9635
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Chris Dalton <csmartdalton@google.com>
4 files changed