Enable support for CSS Conditional Rules

Source/core/css/CSSSupportsRule.cpp

 /* Copyright (C) 2012 Motorola Mobility 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.
  * 2. Redistributions in binary form must reproduce the above
  *    copyright notice, this list of conditions and the following disclaimer in
@@ skipping 21 matching lines @@
 #include "CSSParser.h"
 #include "CSSRule.h"
 #include "CSSRuleList.h"
 #include "CSSStyleSheet.h"
 #include "ExceptionCode.h"
 #include "StyleRule.h"
 #include "WebCoreMemoryInstrumentation.h"
 #include <wtf/MemoryInstrumentationVector.h>
 #include <wtf/text/StringBuilder.h>
 
-#if ENABLE(CSS3_CONDITIONAL_RULES)
-
 namespace WebCore {
 
 CSSSupportsRule::CSSSupportsRule(StyleRuleSupports* supportsRule, CSSStyleSheet* parent)
     : CSSGroupingRule(supportsRule, parent)
 {
 }
 
 String CSSSupportsRule::cssText() const
 {
     StringBuilder result;
 
     result.append("@supports ");
     result.append(conditionText());
     result.append(" {\n");
     appendCssTextForItems(result);
     result.append('}');
 
     return result.toString();
 }
 
 String CSSSupportsRule::conditionText() const
 {
     return toStyleRuleSupports(m_groupRule.get())->conditionText();
 }
 
 } // namespace WebCore
-
-#endif