Work around dump() logging messages to the js console by not having the js console call dump(). Also fix the console code so that string messages (originating from logStringMessage() calls) get printed properly, and adjust the number of saved console messages to match that of the underlying console service. r=jband, a=beard git-svn-id: svn://10.0.0.236/trunk@76590 18797224-902f-48f8-a5cc-f745e15eee43