Remove unused function GrDrawOp::DumpPipelineInfo

This was used by subclasses of GrLegacyMeshDrawOp.

Change-Id: I421589dfdc253bdf43aeac9fa9af0647c70811dd
Reviewed-on: https://skia-review.googlesource.com/25804
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
3 files changed