first attempt at fixing build bustage for bug 238773

-- editors note -- this is not the right fix and is in direct conflict with bryner's fix which is correct.

content/events/src/nsDOMUIEvent.h

@@ -71,7 +71,7 @@ public:
 protected:
 
   // Internal helper functions
-  nsresult GetScrollInfo(nsIScrollableView** aScrollableView, float* aP2T,
+  NS_IMETHOD GetScrollInfo(nsIScrollableView** aScrollableView, float* aP2T,
                          float* aT2P);
   nsPoint GetClientPoint();
   nsPoint GetScreenPoint();