Make CSSValuePair store const CSSValues

third_party/WebKit/Source/core/css/CSSValuePair.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
  *
  * 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 @@
 #include "core/style/ComputedStyle.h"
 #include "platform/Length.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 class CORE_EXPORT CSSValuePair : public CSSValue {
 public:
     enum IdenticalValuesPolicy { DropIdenticalValues, KeepIdenticalValues };
 
-    static CSSValuePair* create(CSSValue* first, CSSValue* second,
+    static CSSValuePair* create(const CSSValue* first, const CSSValue* second,
         IdenticalValuesPolicy identicalValuesPolicy)
     {
         return new CSSValuePair(first, second, identicalValuesPolicy);
     }
 
     static CSSValuePair* create(const LengthSize& lengthSize, const ComputedStyle& style)
     {
         return new CSSValuePair(CSSPrimitiveValue::create(lengthSize.width(), style.effectiveZoom()), CSSPrimitiveValue::create(lengthSize.height(), style.effectiveZoom()), KeepIdenticalValues);
     }
 
-    // TODO(sashab): Remove these non-const versions.
-    CSSValue& first() { return *m_first; }
-    CSSValue& second() { return *m_second; }
     const CSSValue& first() const { return *m_first; }
     const CSSValue& second() const { return *m_second; }
 
     String customCSSText() const
     {
         String first = m_first->cssText();
         String second = m_second->cssText();
         if (m_identicalValuesPolicy == DropIdenticalValues && first == second)
             return first;
         return first + ' ' + second;
     }
 
     bool equals(const CSSValuePair& other) const
     {
         ASSERT(m_identicalValuesPolicy == other.m_identicalValuesPolicy);
         return compareCSSValuePtr(m_first, other.m_first)
             && compareCSSValuePtr(m_second, other.m_second);
     }
 
     DECLARE_TRACE_AFTER_DISPATCH();
 
 private:
-    CSSValuePair(CSSValue* first, CSSValue* second, IdenticalValuesPolicy identicalValuesPolicy)
+    CSSValuePair(const CSSValue* first, const CSSValue* second, IdenticalValuesPolicy identicalValuesPolicy)
         : CSSValue(ValuePairClass)
         , m_first(first)
         , m_second(second)
         , m_identicalValuesPolicy(identicalValuesPolicy)
     {
         ASSERT(m_first);
         ASSERT(m_second);
     }
 
-    Member<CSSValue> m_first;
-    Member<CSSValue> m_second;
+    Member<const CSSValue> m_first;
+    Member<const CSSValue> m_second;
     IdenticalValuesPolicy m_identicalValuesPolicy;
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSValuePair, isValuePair());
 
 } // namespace blink
 
 #endif // CSSValuePair_h