--- a/dom/base/Selection.cpp
+++ b/dom/base/Selection.cpp
@@ -2210,17 +2210,17 @@ Selection::StopAutoScrollTimer()
 {
   if (mAutoScrollTimer) {
     return mAutoScrollTimer->Stop();
   }
   return NS_OK;
 }
 
 nsresult
-Selection::DoAutoScroll(nsIFrame* aFrame, nsPoint& aPoint)
+Selection::DoAutoScroll(nsIFrame* aFrame, nsPoint aPoint)
 {
   NS_PRECONDITION(aFrame, "Need a frame");
 
   if (mAutoScrollTimer) {
     (void)mAutoScrollTimer->Stop();
   }
 
   nsPresContext* presContext = aFrame->PresContext();

--- a/dom/base/Selection.h
+++ b/dom/base/Selection.h
@@ -329,17 +329,17 @@ public:
    */
   nsresult SetTextRangeStyle(nsRange* aRange,
                              const TextRangeStyle& aTextRangeStyle);
 
 private:
   friend class ::nsAutoScrollTimer;
 
   // Note: DoAutoScroll might destroy arbitrary frames etc.
-  nsresult DoAutoScroll(nsIFrame *aFrame, nsPoint& aPoint);
+  nsresult DoAutoScroll(nsIFrame* aFrame, nsPoint aPoint);
 
   // We are not allowed to be in nodes whose root is not our document
   bool HasSameRoot(nsINode& aNode);
 
   // XXX Please don't add additional uses of this method, it's only for
   // XXX supporting broken code (bug 1245883) in the following classes:
   friend class ::nsCopySupport;
   friend class ::nsHTMLCopyEncoder;