Remove ENABLE_CUSTOM_ELEMENTS compile time flag

Source/core/dom/CustomElementConstructor.cpp

 /*
  * 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 12 matching lines @@
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
-#if ENABLE(CUSTOM_ELEMENTS)
-
 #include "CustomElementConstructor.h"
 
 #include "CustomElementHelpers.h"
 #include "Document.h"
 #include "HTMLElement.h"
 #include "HTMLNames.h"
 #include "SVGElement.h"
 #include "SVGNames.h"
 #include <wtf/Assertions.h>
 
@@ skipping 44 matching lines @@
 }
 
 PassRefPtr<Element> setTypeExtension(PassRefPtr<Element> element, const AtomicString& typeExtension)
 {
     if (!typeExtension.isEmpty())
         element->setAttribute(HTMLNames::isAttr, typeExtension);
     return element;
 }
 
 }
-
-#endif // ENABLE(CUSTOM_ELEMENTS)