Revert "Removing ref counting from GrXPFactory."

This reverts commit a8f80de2bc17672b4b6f26d3cf6b38123ac850c9.

Reason for revert: nanobench failing on windows bots, possibly others

Change-Id: Iacb8c650064a28654c165665be057377ffb02ba5
Reviewed-on: https://skia-review.googlesource.com/6802
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
34 files changed