Make cssFloat an enumerable property of CSSStyleDeclaration

Source/core/css/CSSComputedStyleDeclaration.h

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser 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 73 matching lines @@
     CSSRule* parentRule() const override;
     unsigned length() const override;
     String item(unsigned index) const override;
     const ComputedStyle* computeComputedStyle() const;
     String getPropertyValue(const String& propertyName) override;
     String getPropertyPriority(const String& propertyName) override;
     String getPropertyShorthand(const String& propertyName) override;
     bool isPropertyImplicit(const String& propertyName) override;
     void setProperty(const String& propertyName, const String& value, const String& priority, ExceptionState&) override;
     String removeProperty(const String& propertyName, ExceptionState&) override;
+    String cssFloat() const;
+    void setCSSFloat(const String&, ExceptionState&);
     String cssText() const override;
     void setCSSText(const String&, ExceptionState&) override;
     PassRefPtrWillBeRawPtr<CSSValue> getPropertyCSSValueInternal(CSSPropertyID) override;
     String getPropertyValueInternal(CSSPropertyID) override;
     void setPropertyInternal(CSSPropertyID, const String& value, bool important, ExceptionState&) override;
 
     bool cssPropertyMatches(CSSPropertyID, const CSSValue*) const override;
 
     RefPtrWillBeMember<Node> m_node;
     PseudoId m_pseudoElementSpecifier;
     bool m_allowVisitedStyle;
 #if !ENABLE(OILPAN)
     unsigned m_refCount;
 #endif
 };
 
 } // namespace blink
 
 #endif // CSSComputedStyleDeclaration_h