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

Source/core/animation/VisibilityStyleInterpolationTest.cpp

Index: Source/core/animation/VisibilityStyleInterpolationTest.cpp
diff --git a/Source/core/animation/VisibilityStyleInterpolationTest.cpp b/Source/core/animation/VisibilityStyleInterpolationTest.cpp
index 3557532163af1ca7e78266d35505b2d4669df02a..68e8c41233827f640a438eec193125718e687226 100644
--- a/Source/core/animation/VisibilityStyleInterpolationTest.cpp
+++ b/Source/core/animation/VisibilityStyleInterpolationTest.cpp
@@ -10,7 +10,7 @@ namespace blink {
 
 class AnimationVisibilityStyleInterpolationTest : public ::testing::Test {
 protected:
-    static PassOwnPtrWillBeRawPtr<InterpolableValue> visibilityToInterpolableValue(const CSSValue& value)
+    static InterpolableValue* visibilityToInterpolableValue(const CSSValue& value)
     {
         return VisibilityStyleInterpolation::visibilityToInterpolableValue(value);
     }
@@ -22,7 +22,7 @@ protected:
 
     static PassRefPtrWillBeRawPtr<CSSValue> roundTrip(PassRefPtrWillBeRawPtr<CSSValue> value, CSSValueID valueID)
     {
-        return interpolableValueToVisibility(visibilityToInterpolableValue(*value).get(), valueID);
+        return interpolableValueToVisibility(visibilityToInterpolableValue(*value), valueID);
     }
 
     static void testPrimitiveValue(PassRefPtrWillBeRawPtr<CSSValue> value, CSSValueID valueID)
@@ -51,7 +51,7 @@ TEST_F(AnimationVisibilityStyleInterpolationTest, ValueIDs)
 
 TEST_F(AnimationVisibilityStyleInterpolationTest, Interpolation)
 {
-    RefPtrWillBeRawPtr<Interpolation> interpolation = VisibilityStyleInterpolation::create(
+    Interpolation* interpolation = VisibilityStyleInterpolation::create(
         *CSSPrimitiveValue::createIdentifier(CSSValueHidden),
         *CSSPrimitiveValue::createIdentifier(CSSValueVisible),
         CSSPropertyVisibility);