Move all RefPtr's to CSSValue to oilpan transition types, except for the one in CSSCursorImageValue.

Source/core/animation/AnimatableNeutralTest.cpp

Index: Source/core/animation/AnimatableNeutralTest.cpp
diff --git a/Source/core/animation/AnimatableNeutralTest.cpp b/Source/core/animation/AnimatableNeutralTest.cpp
index dbf685ab8fd4dc9d4c614c318db132d5050be8fd..2bdf4bc28427f81a3754ec97813f3694c243906d 100644
--- a/Source/core/animation/AnimatableNeutralTest.cpp
+++ b/Source/core/animation/AnimatableNeutralTest.cpp
@@ -47,7 +47,7 @@ TEST(AnimationAnimatableNeutralTest, Create)
 
 TEST(AnimationAnimatableNeutralTest, Add)
 {
-    RefPtr<CSSValue> cssValue = CSSArrayFunctionValue::create();
+    RefPtrWillBeRawPtr<CSSValue> cssValue = CSSArrayFunctionValue::create();
     RefPtr<AnimatableValue> animatableUnknown = AnimatableUnknown::create(cssValue);
 
     EXPECT_EQ(cssValue, toAnimatableUnknown(AnimatableValue::add(animatableUnknown.get(), AnimatableValue::neutralValue()).get())->toCSSValue());