Remove GrRenderTargetContext::desc()

Change-Id: I04bf4a5b443f799896f62fe7aa61b6fb5d5c9c7f
Reviewed-on: https://skia-review.googlesource.com/16918
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
3 files changed