added content state change

xpfe/appshell/src/nsWebShellWindow.cpp

@@ -946,6 +946,13 @@ nsWebShellWindow::ContentChanged(nsIDocument *aDocument,
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsWebShellWindow::ContentStateChanged(nsIDocument *aDocument,
+                                      nsIContent* aContent)
+{
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsWebShellWindow::AttributeChanged(nsIDocument *aDocument,
                                    nsIContent*  aContent,

xpfe/appshell/src/nsWebShellWindow.h

@@ -114,6 +114,8 @@ public:
   NS_IMETHOD ContentChanged(nsIDocument *aDocument,
                             nsIContent* aContent,
                             nsISupports* aSubContent);
+  NS_IMETHOD ContentStateChanged(nsIDocument *aDocument,
+                                 nsIContent* aContent);
   NS_IMETHOD AttributeChanged(nsIDocument *aDocument,
                               nsIContent*  aContent,
                               nsIAtom*     aAttribute,