Changed Pair to be a CSSValue

Source/core/animation/LengthPairStyleInterpolation.cpp

Index: Source/core/animation/LengthPairStyleInterpolation.cpp
diff --git a/Source/core/animation/LengthPairStyleInterpolation.cpp b/Source/core/animation/LengthPairStyleInterpolation.cpp
index 4996158d7cdc8665d889500394e1af2be4222844..e15120aa2ec36bfa602aec890a2d9ed8f27fc67c 100644
--- a/Source/core/animation/LengthPairStyleInterpolation.cpp
+++ b/Source/core/animation/LengthPairStyleInterpolation.cpp
@@ -6,24 +6,23 @@
 #include "core/animation/LengthPairStyleInterpolation.h"
 
 #include "core/animation/LengthStyleInterpolation.h"
-#include "core/css/Pair.h"
+#include "core/css/CSSValuePair.h"
 #include "core/css/resolver/StyleBuilder.h"
 
 namespace blink {
 
 bool LengthPairStyleInterpolation::canCreateFrom(const CSSValue& value)
 {
-    return value.isPrimitiveValue() && toCSSPrimitiveValue(value).getPairValue();
+    return value.isValuePair();
 }
 
 PassOwnPtrWillBeRawPtr<InterpolableValue> LengthPairStyleInterpolation::lengthPairToInterpolableValue(const CSSValue& value)
 {
     OwnPtrWillBeRawPtr<InterpolableList> result = InterpolableList::create(2);
-    Pair* pair = toCSSPrimitiveValue(value).getPairValue();
-    ASSERT(pair);
+    const CSSValuePair& pair = toCSSValuePair(value);
 
-    result->set(0, LengthStyleInterpolation::toInterpolableValue(*pair->first()));
-    result->set(1, LengthStyleInterpolation::toInterpolableValue(*pair->second()));
+    result->set(0, LengthStyleInterpolation::toInterpolableValue(*pair.first()));
+    result->set(1, LengthStyleInterpolation::toInterpolableValue(*pair.second()));
     return result.release();
 }
 
@@ -32,9 +31,7 @@ PassRefPtrWillBeRawPtr<CSSValue> LengthPairStyleInterpolation::interpolableValue
     InterpolableList* lengthPair = toInterpolableList(value);
     RefPtrWillBeRawPtr<CSSPrimitiveValue> first = LengthStyleInterpolation::fromInterpolableValue(*lengthPair->get(0), range);
     RefPtrWillBeRawPtr<CSSPrimitiveValue> second = LengthStyleInterpolation::fromInterpolableValue(*lengthPair->get(1), range);
-    RefPtrWillBeRawPtr<Pair> result = Pair::create(first, second, Pair::KeepIdenticalValues);
-
-    return CSSPrimitiveValue::create(result.release());
+    return CSSValuePair::create(first.release(), second.release(), CSSValuePair::KeepIdenticalValues);
 }
 
 void LengthPairStyleInterpolation::apply(StyleResolverState& state) const