Get rid of method setProperty(): never used in the whole code

Source/core/css/StylePropertySet.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@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 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 187 matching lines @@
 
     void addParsedProperties(const WillBeHeapVector<CSSProperty, 256>&);
     void addParsedProperty(const CSSProperty&);
 
     // These expand shorthand properties into multiple properties.
     bool setProperty(CSSPropertyID, const String& value, bool important = false, StyleSheetContents* contextStyleSheet = 0);
     void setProperty(CSSPropertyID, PassRefPtrWillBeRawPtr<CSSValue>, bool important = false);
 
     // These do not. FIXME: This is too messy, we can do better.
     bool setProperty(CSSPropertyID, CSSValueID identifier, bool important = false);
-    bool setProperty(CSSPropertyID, CSSPropertyID identifier, bool important = false);
     void appendPrefixingVariantProperty(const CSSProperty&);
     void setPrefixingVariantProperty(const CSSProperty&);
     void setProperty(const CSSProperty&, CSSProperty* slot = 0);
 
     bool removeProperty(CSSPropertyID, String* returnText = 0);
     void removePrefixedOrUnprefixedProperty(CSSPropertyID);
     void removeBlockProperties();
     bool removePropertiesInSet(const CSSPropertyID* set, unsigned length);
     void removeEquivalentProperties(const StylePropertySet*);
     void removeEquivalentProperties(const CSSStyleDeclaration*);
@@ skipping 81 matching lines @@
 inline int StylePropertySet::findPropertyIndex(CSSPropertyID propertyID) const
 {
     if (m_isMutable)
         return toMutableStylePropertySet(this)->findPropertyIndex(propertyID);
     return toImmutableStylePropertySet(this)->findPropertyIndex(propertyID);
 }
 
 } // namespace blink
 
 #endif // StylePropertySet_h