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

Source/core/animation/ShadowStyleInterpolationTest.cpp

Index: Source/core/animation/ShadowStyleInterpolationTest.cpp
diff --git a/Source/core/animation/ShadowStyleInterpolationTest.cpp b/Source/core/animation/ShadowStyleInterpolationTest.cpp
index b218dda741e229363b919728725a2f477b09c00c..a44b6c600390feaeb83aa7c4f7c45fb9cacce36b 100644
--- a/Source/core/animation/ShadowStyleInterpolationTest.cpp
+++ b/Source/core/animation/ShadowStyleInterpolationTest.cpp
@@ -19,7 +19,7 @@ class AnimationShadowStyleInterpolationTest : public ::testing::Test {
 
 protected:
 
-    static PassOwnPtrWillBeRawPtr<InterpolableValue> shadowToInterpolableValue(const CSSValue& value, bool styleFlag)
+    static InterpolableValue* shadowToInterpolableValue(const CSSValue& value, bool styleFlag)
     {
         return ShadowStyleInterpolation::shadowToInterpolableValue(value, styleFlag);
     }
@@ -31,7 +31,7 @@ protected:
 
     static PassRefPtrWillBeRawPtr<CSSValue> roundTrip(PassRefPtrWillBeRawPtr<CSSValue> value, bool styleFlag)
     {
-        return interpolableValueToShadow(shadowToInterpolableValue(*value, styleFlag).get(), styleFlag);
+        return interpolableValueToShadow(shadowToInterpolableValue(*value, styleFlag), styleFlag);
     }
 
     static void testPrimitiveValues(RefPtrWillBeRawPtr<CSSValue> value, double xExpected, double yExpected, double blurExpected, double spreadExpected,