diff --git a/mozilla/layout/generic/nsHTMLFrame.cpp b/mozilla/layout/generic/nsHTMLFrame.cpp
index f45304e1f04..e4257826e24 100644
--- a/mozilla/layout/generic/nsHTMLFrame.cpp
+++ b/mozilla/layout/generic/nsHTMLFrame.cpp
@@ -57,9 +57,6 @@ static NS_DEFINE_IID(kIFrameIID, NS_IFRAME_IID);
  */
 class RootFrame : public nsHTMLContainerFrame {
 public:
-  NS_IMETHOD SetInitialChildList(nsIPresContext& aPresContext,
-                                 nsIAtom*        aListName,
-                                 nsIFrame*       aChildList);
   NS_IMETHOD Reflow(nsIPresContext&          aPresContext,
                     nsHTMLReflowMetrics&     aDesiredSize,
                     const nsHTMLReflowState& aReflowState,
@@ -104,15 +101,6 @@ NS_NewRootFrame(nsIFrame*& aResult)
   return NS_OK;
 }
 
-NS_IMETHODIMP
-RootFrame::SetInitialChildList(nsIPresContext& aPresContext,
-                               nsIAtom*        aListName,
-                               nsIFrame*       aChildList)
-{
-  mFrames.SetFrames(aChildList);
-  return NS_OK;
-}
-
 // XXX Temporary hack until we support the CSS2 'min-width', 'max-width',
 // 'min-height', and 'max-height' properties. Then we can do this in a top-down
 // fashion
diff --git a/mozilla/layout/html/base/src/nsHTMLFrame.cpp b/mozilla/layout/html/base/src/nsHTMLFrame.cpp
index f45304e1f04..e4257826e24 100644
--- a/mozilla/layout/html/base/src/nsHTMLFrame.cpp
+++ b/mozilla/layout/html/base/src/nsHTMLFrame.cpp
@@ -57,9 +57,6 @@ static NS_DEFINE_IID(kIFrameIID, NS_IFRAME_IID);
  */
 class RootFrame : public nsHTMLContainerFrame {
 public:
-  NS_IMETHOD SetInitialChildList(nsIPresContext& aPresContext,
-                                 nsIAtom*        aListName,
-                                 nsIFrame*       aChildList);
   NS_IMETHOD Reflow(nsIPresContext&          aPresContext,
                     nsHTMLReflowMetrics&     aDesiredSize,
                     const nsHTMLReflowState& aReflowState,
@@ -104,15 +101,6 @@ NS_NewRootFrame(nsIFrame*& aResult)
   return NS_OK;
 }
 
-NS_IMETHODIMP
-RootFrame::SetInitialChildList(nsIPresContext& aPresContext,
-                               nsIAtom*        aListName,
-                               nsIFrame*       aChildList)
-{
-  mFrames.SetFrames(aChildList);
-  return NS_OK;
-}
-
 // XXX Temporary hack until we support the CSS2 'min-width', 'max-width',
 // 'min-height', and 'max-height' properties. Then we can do this in a top-down
 // fashion