- Don't allow the old binding to go away as we insert the new binding into the chain. - When swapping the nsXBLInsertionPoint array for a content node, remove any entries from the old list that are also in the new list, so that we don't delete them. Bug 296375, r+sr=bzbarsky, a=asa. git-svn-id: svn://10.0.0.236/branches/MOZILLA_1_8_BRANCH@179513 18797224-902f-48f8-a5cc-f745e15eee43