Remove GrLegacyMeshDrawOp and GrPipelineBuilder

Change-Id: Ib301a0e7d4b4c4f05417d28862017307949748c9
Reviewed-on: https://skia-review.googlesource.com/23584
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
34 files changed