Clean up some CSSPropertyID helpers

Source/core/css/parser/CSSPropertyParser.cpp

Index: Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/Source/core/css/parser/CSSPropertyParser.cpp b/Source/core/css/parser/CSSPropertyParser.cpp
index 8b082c78598b56264b1ab0d8053348048309681e..79160ed8c698a92588d6407a014c956e9dc82b4a 100644
--- a/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/Source/core/css/parser/CSSPropertyParser.cpp
@@ -7541,23 +7541,6 @@ CSSPropertyID unresolvedCSSPropertyID(const String& string)
     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);
-}
-
 template <typename CharacterType>
 static CSSValueID cssValueKeywordID(const CharacterType* valueKeyword, unsigned length)
 {