Make Event.path() return a pre-calculated NodeList rather than calculating it dynamically.

Source/core/dom/Event.cpp

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2005, 2006, 2008 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 188 matching lines @@
     for (Event* e = ue.get(); e; e = e->underlyingEvent())
         if (e == this)
             return;
     m_underlyingEvent = ue;
 }
 
 PassRefPtr<NodeList> Event::path() const
 {
     if (!m_currentTarget || !m_currentTarget->toNode())
         return StaticNodeList::createEmpty();
-    TreeScope* currentScope = m_currentTarget->toNode()->treeScope();
-    Vector<RefPtr<Node> > nodes;
+    Node* node = m_currentTarget->toNode();
     size_t eventPathSize = m_eventPath.size();
     for (size_t i = 0; i < eventPathSize; ++i) {
-        Node* node = m_eventPath[i]->node();
-        ASSERT(node);
-        if (node->treeScope()->isInclusiveAncestorOf(currentScope))
-            nodes.append(node);
+        if (node == m_eventPath[i]->node()) {
+            ASSERT(m_eventPath[i]->eventPath());
+            return m_eventPath[i]->eventPath();
+        }
     }
-    return StaticNodeList::adopt(nodes);
+    return StaticNodeList::createEmpty();
 }
 
 } // namespace WebCore