Dummy implementation for 2 new methods in nsIWebNavigation. fix burning tree.

embedding/browser/webBrowser/nsWebBrowser.cpp

@@ -434,6 +434,24 @@ NS_IMETHODIMP nsWebBrowser::GetSessionHistory(nsISHistory** aSessionHistory)
    return NS_OK;
 }
 
+NS_IMETHODIMP
+nsWebBrowser::AddChildSHEntry(nsISHEntry * aCloneRef, nsISHEntry * aNewEntry)
+{
+
+  //XXX Not yet implemented
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsWebBrowser::GetSHEForChild(PRInt32 aChildOffset, nsISHEntry ** aResult)
+{
+
+    // XXX Not yet implemented
+	return NS_OK;
+
+}
+
+
 //*****************************************************************************
 // nsWebBrowser::nsIWebProgress
 //*****************************************************************************