Do not dispatch events in Document::nodeChildrenWillBeRemoved().

Source/core/dom/ContainerNode.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 529 matching lines @@
     {
         // Removing focus can cause frames to load, either via events (focusout, blur)
         // or widget updates (e.g., for <embed>).
         SubframeLoadingDisabler disabler(this);
 
         // Exclude this node when looking for removed focusedElement since only
         // children will be removed.
         // This must be later than willRemoveChildren, which might change focus
         // state of a child.
         document().removeFocusedElementOfSubtree(this, true);
+
+        // Removing a node from a selection can cause widget updates.
+        document().nodeChildrenWillBeRemoved(this);
     }
 
-    document().nodeChildrenWillBeRemoved(this);
 
     NodeVector removedChildren;
     {
         RenderWidget::UpdateSuspendScope suspendWidgetHierarchyUpdates;
         {
             NoEventDispatchAssertion assertNoEventDispatch;
             removedChildren.reserveInitialCapacity(childNodeCount());
             while (m_firstChild) {
                 removedChildren.append(m_firstChild);
                 removeBetween(0, m_firstChild->nextSibling(), *m_firstChild);
@@ skipping 426 matching lines @@
         return true;
 
     if (node->isElementNode() && toElement(node)->shadow())
         return true;
 
     return false;
 }
 #endif
 
 } // namespace WebCore