Made CSSPrimitiveValue::getString() only work for String types

Source/core/css/CSSCounterValue.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008 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 16 matching lines @@
 
 namespace blink {
 
 class CSSCounterValue : public CSSValue {
 public:
     static PassRefPtrWillBeRawPtr<CSSCounterValue> create(PassRefPtrWillBeRawPtr<CSSPrimitiveValue> identifier, PassRefPtrWillBeRawPtr<CSSPrimitiveValue> listStyle, PassRefPtrWillBeRawPtr<CSSPrimitiveValue> separator)
     {
         return adoptRefWillBeNoop(new CSSCounterValue(identifier, listStyle, separator));
     }
 
-    String identifier() const { return m_identifier ? m_identifier->getStringValue() : String(); }
-    String listStyle() const { return m_listStyle ? m_listStyle->getStringValue() : String(); }
-    String separator() const { return m_separator ? m_separator->getStringValue() : String(); }
+    String identifier() const { return m_identifier->getStringValue(); }
+    String listStyle() const { return m_listStyle->cssText(); }
+    String separator() const { return m_separator->getStringValue(); }
 
-    CSSValueID listStyleIdent() const { return m_listStyle ? m_listStyle->getValueID() : CSSValueInvalid; }
+    CSSValueID listStyleIdent() const { return m_listStyle->getValueID(); }
 
     bool equals(const CSSCounterValue& other) const
     {
         return identifier() == other.identifier()
             && listStyle() == other.listStyle()
             && separator() == other.separator();
     }
 
     String customCSSText() const;
 
     DECLARE_TRACE_AFTER_DISPATCH();
 
 private:
     CSSCounterValue(PassRefPtrWillBeRawPtr<CSSPrimitiveValue> identifier, PassRefPtrWillBeRawPtr<CSSPrimitiveValue> listStyle, PassRefPtrWillBeRawPtr<CSSPrimitiveValue> separator)
         : CSSValue(CounterClass)
         , m_identifier(identifier)
         , m_listStyle(listStyle)
-        , m_separator(separator) { }
+        , m_separator(separator)
+    {
+        ASSERT(m_identifier->isCustomIdent());
+        ASSERT(m_listStyle->isValueID());
+        ASSERT(m_separator->isCustomIdent());
+    }
 
     RefPtrWillBeMember<CSSPrimitiveValue> m_identifier; // string
     RefPtrWillBeMember<CSSPrimitiveValue> m_listStyle; // ident
     RefPtrWillBeMember<CSSPrimitiveValue> m_separator; // string
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSCounterValue, isCounterValue());
 
 } // namespace blink
 
 #endif // CSSCounterValue_h