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

Source/core/testing/Internals.cpp

 /*
  * 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 614 matching lines @@
         ec = INVALID_ACCESS_ERR;
         return 0;
     }
 
     if (ElementShadow* shadow = host->shadow())
         return shadow->youngestShadowRoot();
 
     return host->createShadowRoot(ec).get();
 }
 
-ShadowRoot* Internals::createShadowRoot(Element* host, ExceptionCode& ec)
-{
-    if (!host) {
-        ec = INVALID_ACCESS_ERR;
-        return 0;
-    }
-    return host->createShadowRoot(ec).get();
-}
-
 ShadowRoot* Internals::shadowRoot(Element* host, ExceptionCode& ec)
 {
     // FIXME: Internals::shadowRoot() in tests should be converted to youngestShadowRoot() or oldestShadowRoot().
     // https://bugs.webkit.org/show_bug.cgi?id=78465
     return youngestShadowRoot(host, ec);
 }
 
 ShadowRoot* Internals::youngestShadowRoot(Element* host, ExceptionCode& ec)
 {
     if (!host) {
@@ skipping 1339 matching lines @@
 
     RenderObject* renderer = select->renderer();
     if (!renderer->isMenuList())
         return false;
 
     RenderMenuList* menuList = toRenderMenuList(renderer);
     return menuList->popupIsVisible();
 }
 
 }