Really remove config.h

sky/engine/core/dom/custom/custom_element_registry.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "sky/engine/config.h"
 #include "sky/engine/core/dom/custom/custom_element_registry.h"
 
 #include "sky/engine/core/dom/Element.h"
 #include "sky/engine/core/html/HTMLElement.h"
 
 namespace blink {
 
 CustomElementRegistry::CustomElementRegistry() {
 }
 
@@ skipping 23 matching lines @@
       RefPtr<Element> element = DartConverter<Element*>::FromDart(wrapper);
       DCHECK(element);
       DCHECK(element->isUpgradedCustomElement());
       return element.release();
     }
   }
   return HTMLElement::create(QualifiedName(name), document);
 }
 
 } // namespace blink