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

Source/core/animation/LengthBoxStyleInterpolation.cpp

Index: Source/core/animation/LengthBoxStyleInterpolation.cpp
diff --git a/Source/core/animation/LengthBoxStyleInterpolation.cpp b/Source/core/animation/LengthBoxStyleInterpolation.cpp
index 53440c0aae4c8741b248d0a92d6d43adae1c025b..04709eb36ba9865569473c509b93a3ce2a0d4ef0 100644
--- a/Source/core/animation/LengthBoxStyleInterpolation.cpp
+++ b/Source/core/animation/LengthBoxStyleInterpolation.cpp
@@ -21,20 +21,20 @@ bool onlyInterpolateBetweenLengthAndCSSValueAuto(Rect& startRect, Rect& endRect)
 
 } // namespace
 
-PassRefPtrWillBeRawPtr<LengthBoxStyleInterpolation> LengthBoxStyleInterpolation::maybeCreateFrom(CSSValue& start, CSSValue& end, CSSPropertyID id)
+LengthBoxStyleInterpolation* LengthBoxStyleInterpolation::maybeCreateFrom(CSSValue& start, CSSValue& end, CSSPropertyID id)
 {
     bool startRect = start.isPrimitiveValue() && toCSSPrimitiveValue(start).isRect();
     bool endRect = end.isPrimitiveValue() && toCSSPrimitiveValue(end).isRect();
 
     if (startRect && endRect)
-        return adoptRefWillBeNoop(new LengthBoxStyleInterpolation(lengthBoxtoInterpolableValue(start, end, false), lengthBoxtoInterpolableValue(end, start, true), id, &start, &end));
+        return new LengthBoxStyleInterpolation(lengthBoxtoInterpolableValue(start, end, false), lengthBoxtoInterpolableValue(end, start, true), id, &start, &end);
     return nullptr;
 }
 
-PassOwnPtrWillBeRawPtr<InterpolableValue> LengthBoxStyleInterpolation::lengthBoxtoInterpolableValue(const CSSValue& lengthBox, const CSSValue& matchingValue, bool isEndInterpolation)
+InterpolableValue* LengthBoxStyleInterpolation::lengthBoxtoInterpolableValue(const CSSValue& lengthBox, const CSSValue& matchingValue, bool isEndInterpolation)
 {
     const int numberOfSides = 4;
-    OwnPtrWillBeRawPtr<InterpolableList> result = InterpolableList::create(numberOfSides);
+    InterpolableList* result = InterpolableList::create(numberOfSides);
     Rect* rect = toCSSPrimitiveValue(lengthBox).getRectValue();
     Rect* matchingRect = toCSSPrimitiveValue(matchingValue).getRectValue();
     CSSPrimitiveValue* side[numberOfSides] = { rect->left(), rect->right(), rect->top(), rect->bottom() };
@@ -48,7 +48,7 @@ PassOwnPtrWillBeRawPtr<InterpolableValue> LengthBoxStyleInterpolation::lengthBox
             result->set(i, LengthStyleInterpolation::toInterpolableValue(*side[i]));
         }
     }
-    return result.release();
+    return result;
 }
 
 bool LengthBoxStyleInterpolation::usesDefaultInterpolation(const CSSValue& start, const CSSValue& end)