make SkRecord normally SkRefCnt'd

SkRecord used SkNVRefCnt to avoid adding a vptr.

SkMiniPicture covers the really small allocations,
so there's really no reason to fret over an extra pointer here.

BUG=skia:6484

Change-Id: Ifa43be8eb352b2d59851c75e6b4f164bb38b5ef6
Reviewed-on: https://skia-review.googlesource.com/13139
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed