Actually, Elliot, did you want to keep it in the image?  I was removing it pursuant to Bert's suggestion.

After removing it myself, and then doing a Smalltalk garbageCollect, it is no longer anywhere in the image (or Undeclared, either).  (Although BlockContext is, but that's another issue.)

I have added a new package for it if you want to keep it around.  We went here because the ExternalForm was removed from FFI and put into EToys, and then Bert said it wasn't used in EToys (and it isn't).

Now in package: http://source.squeak.org/inbox/GraphicsExternal-cbc.1.mcz