Fix ambiguities relating to the various forms of |operator==| defined for nsCOMPtrs by avoiding |const| for parameters for compilers where it (incorrectly) confuses overload resolution. r=scc@mozilla.org sr=brendan@mozilla.org b=65664 git-svn-id: svn://10.0.0.236/trunk@86187 18797224-902f-48f8-a5cc-f745e15eee43