Remove ENABLE_CUSTOM_ELEMENTS compile time flag

Source/bindings/v8/CustomElementHelpers.h

 /*
  * Copyright (C) 2012 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 27 matching lines @@
 #include "bindings/v8/V8DOMWrapper.h"
 #include "core/dom/CustomElementConstructor.h"
 #include "core/dom/CustomElementRegistry.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
-#if ENABLE(CUSTOM_ELEMENTS)
-
 class CustomElementConstructor;
 class CustomElementInvocation;
 class Element;
 class QualifiedName;
 class ScriptState;
 
 class CustomElementHelpers {
 public:
     static bool initializeConstructorWrapper(CustomElementConstructor*, const ScriptValue& prototype, ScriptState*);
     static bool isValidPrototypeParameter(const ScriptValue&, ScriptState*, AtomicString& namespaceURI);
@@ skipping 33 matching lines @@
         return registry->findFor(element);
     return 0;
 }
 
 inline bool CustomElementHelpers::isValidPrototypeParameter(const ScriptValue& value, ScriptState* state)
 {
     AtomicString namespaceURI;
     return isValidPrototypeParameter(value, state, namespaceURI);
 }
 
-#endif // ENABLE(CUSTOM_ELEMENTS)
-
 } // namespace WebCore
 
 #endif // CustomElementHelpers_h