Remove old factory for Image()

Bug: skia:7650
Change-Id: I044c25206885669ae2e60cccb7a1cb4ef3a1430f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/370796
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed