CSSValue Immediates: Replace CSSValue usage with const references

Source/core/animation/CSSValueInterpolationType.cpp

Index: Source/core/animation/CSSValueInterpolationType.cpp
diff --git a/Source/core/animation/CSSValueInterpolationType.cpp b/Source/core/animation/CSSValueInterpolationType.cpp
index 90e10b35c2f43752c1144a230460645c9ae2a0cc..6fab5926a6ebe0a97b49ea329de05548f77242bc 100644
--- a/Source/core/animation/CSSValueInterpolationType.cpp
+++ b/Source/core/animation/CSSValueInterpolationType.cpp
@@ -16,9 +16,8 @@ PassOwnPtrWillBeRawPtr<InterpolationValue> CSSValueInterpolationType::maybeConve
 
 void CSSValueInterpolationType::apply(const InterpolableValue&, const NonInterpolableValue* nonInterpolableValue, StyleResolverState& state) const
 {
-    NullableCSSValue value = toDefaultNonInterpolableValue(nonInterpolableValue)->cssValue();
-    if (value)
-        StyleBuilder::applyProperty(m_property, state, *value);
+    const CSSValue& value = toDefaultNonInterpolableValue(nonInterpolableValue)->cssValue();
+    StyleBuilder::applyProperty(m_property, state, value);
 }
 
 DEFINE_NON_INTERPOLABLE_VALUE_TYPE(DefaultNonInterpolableValue);