[Oilpan] Migrate most classes under core/animations to Oilpan heap.

Source/core/animation/FilterStyleInterpolationTest.cpp

Index: Source/core/animation/FilterStyleInterpolationTest.cpp
diff --git a/Source/core/animation/FilterStyleInterpolationTest.cpp b/Source/core/animation/FilterStyleInterpolationTest.cpp
index a1d08fb79aa964e0de443f35f11872ef95aa1176..740739dc3f88e8b23b743b96ab729c1fa1baa650 100644
--- a/Source/core/animation/FilterStyleInterpolationTest.cpp
+++ b/Source/core/animation/FilterStyleInterpolationTest.cpp
@@ -17,7 +17,7 @@ protected:
     {
         CSSValueID functionType;
         ASSERT_TRUE(FilterStyleInterpolation::canCreateFrom(value, value));
-        OwnPtrWillBeRawPtr<InterpolableValue> interpolableValue = FilterStyleInterpolation::toInterpolableValue(value, functionType);
+        InterpolableValue* interpolableValue = FilterStyleInterpolation::toInterpolableValue(value, functionType);
         RefPtrWillBeRawPtr<CSSFunctionValue> result = FilterStyleInterpolation::fromInterpolableValue(*interpolableValue, functionType);
         ASSERT_TRUE(value.equals(*result));
     }