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

Source/core/css/resolver/AnimatedStyleBuilder.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 137 matching lines @@
 {
     if (value->isLengthSize())
         fillLayer->setSize(FillSize(SizeLength, animatableValueToLengthSize(value, state, ValueRangeNonNegative)));
     else
         CSSToStyleMap::mapFillSize(state, fillLayer, toAnimatableUnknown(value)->toCSSValue().get());
 }
 
 template <CSSPropertyID property>
 void setOnFillLayers(FillLayer& fillLayers, const AnimatableValue* value, StyleResolverState& state)
 {
-    const WillBeHeapVector<RefPtrWillBeMember<AnimatableValue>>& values = toAnimatableRepeatable(value)->values();
+    const HeapVector<Member<AnimatableValue>>& values = toAnimatableRepeatable(value)->values();
     ASSERT(!values.isEmpty());
     FillLayer* fillLayer = &fillLayers;
     FillLayer* prev = 0;
     for (size_t i = 0; i < values.size(); ++i) {
         if (!fillLayer)
             fillLayer = prev->ensureNext();
         const AnimatableValue* layerValue = values[i].get();
         switch (property) {
         case CSSPropertyBackgroundImage:
         case CSSPropertyWebkitMaskImage:
@@ skipping 492 matching lines @@
     case CSSPropertyRy:
         style->setRy(animatableValueToLength(value, state, ValueRangeNonNegative));
         return;
 
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 } // namespace blink