[canvaskit] Remove custom_embedded_factory from G3 build

This was causing issue when LLD_REPORT_UNDEFINED was enabled.

Change-Id: Id4aefeca8bccb4457ef53aa7432924243e4e40f7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/346936
Reviewed-by: Kevin Lubick <kjlubick@google.com>
1 file changed