Also clean up for insufficient rv useage, un-commoned JSPRINCIPALS_DROP and improving the control flow for readability. These changes are actually Brendan's...i'm checking this in on his behalf. r=mscott. a=brendan git-svn-id: svn://10.0.0.236/trunk@48969 18797224-902f-48f8-a5cc-f745e15eee43