Remove GrStencilAndCoverTextContext

TBR=bsalomon@google.com
Change-Id: Ibbb26e2ba74df43c3156f95bea258cda998500cb
Reviewed-on: https://skia-review.googlesource.com/105260
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
9 files changed