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

Source/core/css/StylePropertySet.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. 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.
@@ skipping 313 matching lines @@
     if (toReplace && prefixingVariant != property.id())
         *toReplace = CSSProperty(prefixingVariant, property.value(), property.isImportant(), property.isSetFromShorthand(), getIndexInShorthandVectorForPrefixingVariant(property, prefixingVariant), property.metadata().m_implicit);
 }
 
 bool MutableStylePropertySet::setProperty(CSSPropertyID propertyID, CSSValueID identifier, bool important)
 {
     setProperty(CSSProperty(propertyID, cssValuePool().createIdentifierValue(identifier), important));
     return true;
 }
 
-bool MutableStylePropertySet::setProperty(CSSPropertyID propertyID, CSSPropertyID identifier, bool important)
-{
-    setProperty(CSSProperty(propertyID, cssValuePool().createIdentifierValue(identifier), important));
-    return true;
-}
-
 void MutableStylePropertySet::parseDeclaration(const String& styleDeclaration, StyleSheetContents* contextStyleSheet)
 {
     m_propertyVector.clear();
 
     CSSParserContext context(cssParserMode(), UseCounter::getFrom(contextStyleSheet));
     if (contextStyleSheet) {
         context = contextStyleSheet->parserContext();
         context.setMode(cssParserMode());
     }
 
@@ skipping 261 matching lines @@
     result.appendLiteral(": ");
     result.append(propertyValue()->cssText());
     if (isImportant())
         result.appendLiteral(" !important");
     result.append(';');
     return result.toString();
 }
 
 
 } // namespace blink