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

Source/core/css/resolver/StyleResolver.h

Index: Source/core/css/resolver/StyleResolver.h
diff --git a/Source/core/css/resolver/StyleResolver.h b/Source/core/css/resolver/StyleResolver.h
index 6cb1ba1ec74123717e4789a8ade6057da6af3905..6810ed83aafe9ffe3a3a1b271f575592db1afab7 100644
--- a/Source/core/css/resolver/StyleResolver.h
+++ b/Source/core/css/resolver/StyleResolver.h
@@ -94,8 +94,8 @@ public:
     PassRefPtr<ComputedStyle> styleForElement(Element*, const ComputedStyle* parentStyle = 0, StyleSharingBehavior = AllowStyleSharing,
         RuleMatchingBehavior = MatchAllRules);
 
-    static PassRefPtrWillBeRawPtr<AnimatableValue> createAnimatableValueSnapshot(Element&, const ComputedStyle* baseStyle, CSSPropertyID, CSSValue*);
-    static PassRefPtrWillBeRawPtr<AnimatableValue> createAnimatableValueSnapshot(StyleResolverState&, CSSPropertyID, CSSValue*);
+    static AnimatableValue* createAnimatableValueSnapshot(Element&, const ComputedStyle* baseStyle, CSSPropertyID, CSSValue*);
+    static AnimatableValue* createAnimatableValueSnapshot(StyleResolverState&, CSSPropertyID, CSSValue*);
 
     PassRefPtr<ComputedStyle> pseudoStyleForElement(Element*, const PseudoStyleRequest&, const ComputedStyle* parentStyle);
 
@@ -218,7 +218,7 @@ private:
     template <CSSPropertyPriority priority>
     void applyProperties(StyleResolverState&, const StylePropertySet* properties, bool isImportant, bool inheritedOnly, PropertyWhitelistType = PropertyWhitelistNone);
     template <CSSPropertyPriority priority>
-    void applyAnimatedProperties(StyleResolverState&, const WillBeHeapHashMap<PropertyHandle, RefPtrWillBeMember<Interpolation>>&);
+    void applyAnimatedProperties(StyleResolverState&, const HeapHashMap<PropertyHandle, Member<Interpolation>>&);
     template <CSSPropertyPriority priority>
     void applyAllProperty(StyleResolverState&, CSSValue*, bool inheritedOnly);