Make CSSValuePair store const CSSValues

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

Index: third_party/WebKit/Source/core/css/CSSValuePair.h
diff --git a/third_party/WebKit/Source/core/css/CSSValuePair.h b/third_party/WebKit/Source/core/css/CSSValuePair.h
index 9afe52d5359110a43898597e8c04b3e44e7b088c..4069f090f5fb33b253e242e4cb5683cf18f15ebd 100644
--- a/third_party/WebKit/Source/core/css/CSSValuePair.h
+++ b/third_party/WebKit/Source/core/css/CSSValuePair.h
@@ -34,7 +34,7 @@ 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);
@@ -45,9 +45,6 @@ public:
         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; }
 
@@ -70,7 +67,7 @@ public:
     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)
@@ -80,8 +77,8 @@ private:
         ASSERT(m_second);
     }
 
-    Member<CSSValue> m_first;
-    Member<CSSValue> m_second;
+    Member<const CSSValue> m_first;
+    Member<const CSSValue> m_second;
     IdenticalValuesPolicy m_identicalValuesPolicy;
 };