$implContentDecls stores generated code that is put in a namespace 'XXXV8Internal'. For clarification, it should be renamed to $implContentInternals.
Created attachment 191019 [details] Patch
Comment on attachment 191019 [details] Patch ok
I'm not sure the new name is that much better than the old name, but it doesn't seem worse either.
Committed r144588: <http://trac.webkit.org/changeset/144588>