Remove UserAgent ShadowRoot + Author ShadowRoot code.

third_party/WebKit/Source/core/dom/shadow/ShadowRoot.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 16 matching lines @@
 #ifndef ShadowRoot_h
 #define ShadowRoot_h
 
 #include "core/CoreExport.h"
 #include "core/dom/ContainerNode.h"
 #include "core/dom/DocumentFragment.h"
 #include "core/dom/Element.h"
 #include "core/dom/TreeScope.h"
 #include "core/dom/shadow/SlotAssignment.h"
 #include "wtf/DoublyLinkedList.h"
+#include <iosfwd>
 
 namespace blink {
 
 class Document;
 class ElementShadow;
 class ExceptionState;
 class HTMLShadowElement;
 class InsertionPoint;
 class ShadowRootRareData;
 class StyleSheetList;
@@ skipping 146 matching lines @@
     ShadowRoot* root = this->shadowRoot();
     if (root && root->isV1())
         return root;
     return nullptr;
 }
 
 DEFINE_NODE_TYPE_CASTS(ShadowRoot, isShadowRoot());
 DEFINE_TYPE_CASTS(ShadowRoot, TreeScope, treeScope, treeScope->rootNode().isShadowRoot(), treeScope.rootNode().isShadowRoot());
 DEFINE_TYPE_CASTS(TreeScope, ShadowRoot, shadowRoot, true, true);
 
+std::ostream& operator<<(std::ostream&, const ShadowRootType&);
+
 } // namespace blink
 
 #endif // ShadowRoot_h