Switch to malloc/free to be compatible with CanvasKit.Malloc

Inspired by https://skia-review.googlesource.com/c/skia/+/410876

Change-Id: Iaf64f379e74d46b46c795dd5f04db32406b976b4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/411576
Auto-Submit: Mike Reed <reed@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
1 file changed