Remove Internals::createShadowRoot(element) and polyfill.js.

Source/core/testing/Internals.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 64 matching lines @@
 
     bool isPreloaded(const String& url);
     bool isLoadingFromMemoryCache(const String& url);
 
     void crash();
 
     size_t numberOfScopedHTMLStyleChildren(const Node*, ExceptionCode&) const;
     PassRefPtr<CSSComputedStyleDeclaration> computedStyleIncludingVisitedInfo(Node*, ExceptionCode&) const;
 
     ShadowRoot* ensureShadowRoot(Element* host, ExceptionCode&);
-    ShadowRoot* createShadowRoot(Element* host, ExceptionCode&);
     ShadowRoot* shadowRoot(Element* host, ExceptionCode&);
     ShadowRoot* youngestShadowRoot(Element* host, ExceptionCode&);
     ShadowRoot* oldestShadowRoot(Element* host, ExceptionCode&);
     ShadowRoot* youngerShadowRoot(Node* shadow, ExceptionCode&);
     ShadowRoot* olderShadowRoot(Node* shadow, ExceptionCode&);
     String shadowRootType(const Node*, ExceptionCode&) const;
     bool hasShadowInsertionPoint(const Node*, ExceptionCode&) const;
     bool hasContentElement(const Node*, ExceptionCode&) const;
     size_t countElementShadow(const Node*, ExceptionCode&) const;
     Element* includerFor(Node*, ExceptionCode&);
@@ skipping 204 matching lines @@
     Vector<String> iconURLs(Document*, int iconTypesMask) const;
 
     DocumentMarker* markerAt(Node*, const String& markerType, unsigned index, ExceptionCode&);
     RefPtr<DOMWindow> m_frontendWindow;
     OwnPtr<InspectorFrontendChannelDummy> m_frontendChannel;
 };
 
 } // namespace WebCore
 
 #endif