Bug 213273 Browser just exits when open a link in a new tab while running with gtk 2.2 and atk libraries

r=kyle, sr=henry
not for default build

accessible/src/base/nsRootAccessible.cpp

@@ -436,7 +436,14 @@ NS_IMETHODIMP nsRootAccessible::HandleEvent(nsIDOMEvent* aEvent)
   }
 #else
   AtkStateChange stateData;
-  if (eventType.EqualsIgnoreCase("focus") || 
+  if (eventType.EqualsIgnoreCase("unload")) {
+    nsCOMPtr<nsPIAccessibleDocument> privateAccDoc = 
+      do_QueryInterface(accessible);
+    if (privateAccDoc) {
+      privateAccDoc->Destroy();
+    }
+  }
+  else if (eventType.EqualsIgnoreCase("focus") || 
       eventType.EqualsIgnoreCase("DOMMenuItemActive")) {
     if (treeItemAccessible) { // use focused treeitem
       privAcc = do_QueryInterface(treeItemAccessible);

widget/src/gtk2/nsWindow.cpp

@@ -395,9 +395,6 @@ nsWindow::Destroy(void)
 
 #ifdef ACCESSIBILITY
     if (mRootAccessible) {
-        nsCOMPtr<nsPIAccessNode> accNode(do_QueryInterface(mRootAccessible));
-        if (accNode)
-            accNode->Shutdown();
         mRootAccessible = nsnull;
     }
 #endif