Bug 542900. nsPluginInstanceOwner::Init should be calling AddScrollPositionListener. r=roc

--HG--
extra : rebase_source : 403e7ed117c743643d92bf67f1c15e8678c3458d

layout/generic/nsObjectFrame.cpp

@@ -5532,7 +5532,7 @@ nsresult nsPluginInstanceOwner::Init(nsPresContext* aPresContext,
   for (nsIFrame* f = mObjectFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
     nsIScrollableFrame* sf = do_QueryFrame(f);
     if (sf) {
-      sf->RemoveScrollPositionListener(this);
+      sf->AddScrollPositionListener(this);
     }
   }