Only allow reprojecting shadows between ShadowRoots of the same type

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1618 matching lines @@
 
 ShadowRoot* Element::ensureUserAgentShadowRoot()
 {
     if (ShadowRoot* shadowRoot = userAgentShadowRoot())
         return shadowRoot;
     ShadowRoot* shadowRoot = ensureShadow()->addShadowRoot(this, ShadowRoot::UserAgentShadowRoot);
     didAddUserAgentShadowRoot(shadowRoot);
     return shadowRoot;
 }
 
-bool Element::supportsShadowElementForUserAgentShadow() const
-{
-    return true;
-}
-
 bool Element::childTypeAllowed(NodeType type) const
 {
     switch (type) {
     case ELEMENT_NODE:
     case TEXT_NODE:
     case COMMENT_NODE:
     case PROCESSING_INSTRUCTION_NODE:
     case CDATA_SECTION_NODE:
         return true;
     default:
@@ skipping 1981 matching lines @@
     return 0;
 }
 
 Attribute* UniqueElementData::attributeItem(unsigned index)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(index < length());
     return &m_attributeVector.at(index);
 }
 
 } // namespace WebCore