Update the behavior of ShadowRoot.activeElement to match the latest spec

third_party/WebKit/Source/core/dom/Node.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004-2011, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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
@@ skipping 205 matching lines @@
     Node& treeRoot() const;
     Node& shadowIncludingRoot() const;
 
     void remove(ExceptionState& = ASSERT_NO_EXCEPTION);
 
     Node* pseudoAwareNextSibling() const;
     Node* pseudoAwarePreviousSibling() const;
     Node* pseudoAwareFirstChild() const;
     Node* pseudoAwareLastChild() const;
 
+    Node* retarget(const Node& target) const;
+
     const KURL& baseURI() const;
 
     RawPtr<Node> insertBefore(RawPtr<Node> newChild, Node* refChild, ExceptionState& = ASSERT_NO_EXCEPTION);
     RawPtr<Node> replaceChild(RawPtr<Node> newChild, RawPtr<Node> oldChild, ExceptionState& = ASSERT_NO_EXCEPTION);
     RawPtr<Node> removeChild(RawPtr<Node> child, ExceptionState& = ASSERT_NO_EXCEPTION);
     RawPtr<Node> appendChild(RawPtr<Node> newChild, ExceptionState& = ASSERT_NO_EXCEPTION);
 
     bool hasChildren() const { return firstChild(); }
     virtual RawPtr<Node> cloneNode(bool deep) = 0;
     void normalize();
@@ skipping 689 matching lines @@
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showNode(const blink::Node*);
 void showTree(const blink::Node*);
 void showNodePath(const blink::Node*);
 #endif
 
 #endif // Node_h