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

Source/core/inspector/InspectorAnimationAgent.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef InspectorAnimationAgent_h
 #define InspectorAnimationAgent_h
 
 #include "core/CoreExport.h"
 #include "core/InspectorFrontend.h"
 #include "core/css/CSSKeyframesRule.h"
@@ skipping 48 matching lines @@
 
     typedef TypeBuilder::Animation::Animation::Type::Enum AnimationType;
 
     PassRefPtr<TypeBuilder::Animation::Animation> buildObjectForAnimation(Animation&);
     PassRefPtr<TypeBuilder::Animation::Animation> buildObjectForAnimation(Animation&, AnimationType, PassRefPtr<TypeBuilder::Animation::KeyframesRule> keyframeRule = nullptr);
     double normalizedStartTime(Animation&);
     AnimationTimeline& referenceTimeline();
 
     RawPtrWillBeMember<InspectorPageAgent> m_pageAgent;
     RawPtrWillBeMember<InspectorDOMAgent> m_domAgent;
-    WillBeHeapHashMap<String, RefPtrWillBeMember<Animation>> m_idToAnimation;
+    PersistentHeapHashMapWillBeHeapHashMap<String, Member<Animation>> m_idToAnimation;
     WillBeHeapHashMap<String, AnimationType> m_idToAnimationType;
     double m_latestStartTime;
 };
 
 }
 
 #endif // InspectorAnimationAgent_h