[graphite] Remove ref counting from Recorder. Bug: skia:12794 Change-Id: Iefdc2d84991a542533d13c227051c372459564db Reviewed-on: https://skia-review.googlesource.com/c/skia/+/494241 Reviewed-by: Robert Phillips <robertphillips@google.com> Commit-Queue: Greg Daniel <egdaniel@google.com>