Move the CSS Device Adaptation @viewport rule support behind a runtime flag

Source/core/css/resolver/StyleResolver.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 215 matching lines @@
 public:
     bool useSVGZoomRules();
 
     static bool colorFromPrimitiveValueIsDerivedFromElement(CSSPrimitiveValue*);
 
     bool hasSelectorForId(const AtomicString&) const;
     bool hasSelectorForClass(const AtomicString&) const;
     bool hasSelectorForAttribute(const AtomicString&) const;
 
     CSSFontSelector* fontSelector() const { return m_fontSelector.get(); }
-#if ENABLE(CSS_DEVICE_ADAPTATION)
     ViewportStyleResolver* viewportStyleResolver() { return m_viewportStyleResolver.get(); }
-#endif
 
     void addViewportDependentMediaQueryResult(const MediaQueryExp*, bool result);
     bool hasViewportDependentMediaQueries() const { return !m_viewportDependentMediaQueryResults.isEmpty(); }
     bool affectedByViewportChange() const;
 
     void addKeyframeStyle(PassRefPtr<StyleRuleKeyframes>);
 
     bool checkRegionStyle(Element* regionElement);
 
     bool usesSiblingRules() const { return !m_features.siblingRules.isEmpty(); }
@@ skipping 171 matching lines @@
     RefPtr<RenderStyle> m_rootDefaultStyle;
 
     Document* m_document;
     SelectorFilter m_selectorFilter;
 
     bool m_matchAuthorAndUserStyles;
 
     RefPtr<CSSFontSelector> m_fontSelector;
     Vector<OwnPtr<MediaQueryResult> > m_viewportDependentMediaQueryResults;
 
-#if ENABLE(CSS_DEVICE_ADAPTATION)
     RefPtr<ViewportStyleResolver> m_viewportStyleResolver;
-#endif
 
     const DeprecatedStyleBuilder& m_styleBuilder;
     ScopedStyleTree m_styleTree;
 
     RuleFeatureSet m_features;
     OwnPtr<RuleSet> m_siblingRuleSet;
     OwnPtr<RuleSet> m_uncommonAttributeRuleSet;
 
     CSSToStyleMap m_styleMap;
     InspectorCSSOMWrappers m_inspectorCSSOMWrappers;
@@ skipping 38 matching lines @@
         PseudoId ignoreDynamicPseudo = NOPSEUDO;
         if (selectorChecker.match(selectorCheckingContext, ignoreDynamicPseudo, DOMSiblingTraversalStrategy()) == SelectorChecker::SelectorMatches)
             return true;
     }
     return false;
 }
 
 } // namespace WebCore
 
 #endif // StyleResolver_h