Remove CSSParserValue::createCSSValue and unused callers

Source/core/css/CSSFunctionValue.cpp

Index: Source/core/css/CSSFunctionValue.cpp
diff --git a/Source/core/css/CSSFunctionValue.cpp b/Source/core/css/CSSFunctionValue.cpp
index 9dde2e72e075be872eee9e79dae4366e6ca1d9df..2c30f7e0a784510f91a31e1007777f6ba1a6d9de 100644
--- a/Source/core/css/CSSFunctionValue.cpp
+++ b/Source/core/css/CSSFunctionValue.cpp
@@ -27,19 +27,10 @@
 #include "core/css/CSSFunctionValue.h"
 
 #include "core/css/CSSValueList.h"
-#include "core/css/parser/CSSParserValues.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
-CSSFunctionValue::CSSFunctionValue(CSSParserFunction* function)
-    : CSSValue(FunctionClass)
-    , m_name(function->name)
-{
-    if (function->args)
-        m_args = CSSValueList::createFromParserValueList(function->args.get());
-}
-
 CSSFunctionValue::CSSFunctionValue(String name, PassRefPtrWillBeRawPtr<CSSValueList> args)
     : CSSValue(FunctionClass)
     , m_name(name)