Bug 449543 - nsExpirationTracker's Iterator doesn't work properly, r=roc a=bsmedberg

xpcom/ds/nsExpirationTracker.h

@@ -251,6 +251,7 @@ template <class T, PRUint32 K> class nsExpirationTracker {
             return (*generation)[mIndex - 1];
           }
           ++mGeneration;
+          mIndex = 0;
         }
         return nsnull;
       }