Fixing bug 124412. Making nsXULDocument inherit nsXMLDocument to avoid the need to duplicate a large amount of code in nsXULDocument. Also removing nsMarkupDocument and nsIDOMEventCapturer that are no longer needed. Changing the inheritance of nsIDOMXULDocument to avoid ~60 or so forwarding methods, and doing a *lot* of code cleanup. r=bugmail@sicking.cc, sr=peterv@netscape.com
git-svn-id: svn://10.0.0.236/trunk@140344 18797224-902f-48f8-a5cc-f745e15eee43
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