Use BackendSurfaceFactory in Vk protected unit tests.

Automatically handles cleanup of backend objects.

Removes use case of MakeFromBackendTextureAsRenderTarget.

Bug: skia:9832
Change-Id: I27c2b4cae713bd605a662d38b797fd25c1add98e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/324119
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed