Remove accessRenderTarget calls in service of binding stencil buffer

Change-Id: Ifca6e21c619a0433ecf0b8699d92661f8c3068a8
Reviewed-on: https://skia-review.googlesource.com/31243
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
11 files changed