Clean up some CSSPropertyID helpers

Source/core/css/parser/CSSPropertyParser.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 7523 matching lines @@
     unsigned length = string.length();
 
     if (!length)
         return CSSPropertyInvalid;
     if (length > maxCSSPropertyNameLength)
         return CSSPropertyInvalid;
 
     return string.is8Bit() ? unresolvedCSSPropertyID(string.characters8(), length) : unresolvedCSSPropertyID(string.characters16(), length);
 }
 
-CSSPropertyID cssPropertyID(const String& string)
-{
-    return resolveCSSPropertyID(unresolvedCSSPropertyID(string));
-}
-
 CSSPropertyID unresolvedCSSPropertyID(const CSSParserString& string)
 {
     unsigned length = string.length();
 
     if (!length)
         return CSSPropertyInvalid;
     if (length > maxCSSPropertyNameLength)
         return CSSPropertyInvalid;
 
     return string.is8Bit() ? unresolvedCSSPropertyID(string.characters8(), length) : unresolvedCSSPropertyID(string.characters16(), length);
@@ skipping 620 matching lines @@
         }
     }
 
     if (!list->length())
         return nullptr;
 
     return list.release();
 }
 
 } // namespace blink