Remove the compile time flag for DATALIST Element.

Source/core/html/InputType.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2009, 2010, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
@@ skipping 880 matching lines @@
 bool InputType::hasTouchEventHandler() const
 {
     return false;
 }
 
 String InputType::defaultToolTip() const
 {
     return String();
 }
 
-#if ENABLE(DATALIST_ELEMENT)
 void InputType::listAttributeTargetChanged()
 {
 }
 
 Decimal InputType::findClosestTickMarkValue(const Decimal&)
 {
     ASSERT_NOT_REACHED();
     return Decimal::nan();
 }
-#endif
 
 void InputType::updateClearButtonVisibility()
 {
 }
 
 bool InputType::supportsIndeterminateAppearance() const
 {
     return false;
 }
 
@@ skipping 181 matching lines @@
 
 void InputType::observeFeatureIfVisible(UseCounter::Feature feature) const
 {
     if (RenderStyle* style = element()->renderStyle()) {
         if (style->visibility() != HIDDEN)
             UseCounter::count(element()->document(), feature);
     }
 }
 
 } // namespace WebCore