Tracking down an obsolete class from a RefactoringBrowser / ClassOrganizer

I have been experimenting with some metaprogramming, which left a ton of
obsolete classes.
Have been able to cure most of them, except for this last one. Pointer
Finder shows:

#EventManager -> EventManager class 
classPool: Dictionary 
#ActionMaps -> WeakIdentityKeyDictionary 
a RefactoringBrowser -> IdentityDictionary
#getCompletionController -> MessageSend
receiver: ECController
model: RefactoringBrowser
classOrganizer: 
subject: AnObsoleteEvoPolygonMorph class

So there appears to be a RefactoringBrowser which has classList nil,
selectedEnvironment nil, etc, but which has classOrganizer with subject
AnObsoleteEvoPolygonMorph.

Is there a safe way to tidy this up please?

...Stan

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