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

Source/core/animation/FilterStyleInterpolation.cpp

Index: Source/core/animation/FilterStyleInterpolation.cpp
diff --git a/Source/core/animation/FilterStyleInterpolation.cpp b/Source/core/animation/FilterStyleInterpolation.cpp
index 4d063c0778be3836c2aaa044ddff34b0c15a65b7..909b3a328d89e2e8986fcb0011255f8cd5c0b90f 100644
--- a/Source/core/animation/FilterStyleInterpolation.cpp
+++ b/Source/core/animation/FilterStyleInterpolation.cpp
@@ -60,7 +60,7 @@ PassRefPtrWillBeRawPtr<CSSValueList> extendFilterList(const CSSValueList& shortF
     return result.release();
 }
 
-PassRefPtrWillBeRawPtr<FilterStyleInterpolation::FilterListStyleInterpolation> maybeCreateFromList(const CSSValueList& startList, const CSSValueList& endList, CSSPropertyID property)
+FilterStyleInterpolation::FilterListStyleInterpolation* maybeCreateFromList(const CSSValueList& startList, const CSSValueList& endList, CSSPropertyID property)
 {
     if (startList.length() < endList.length())
         return ListStyleInterpolation<FilterStyleInterpolation>::maybeCreateFromList(*extendFilterList(startList, endList), endList, property);
@@ -69,7 +69,7 @@ PassRefPtrWillBeRawPtr<FilterStyleInterpolation::FilterListStyleInterpolation> m
 
 } // namespace
 
-PassRefPtrWillBeRawPtr<FilterStyleInterpolation::FilterListStyleInterpolation> FilterStyleInterpolation::maybeCreateList(const CSSValue& start, const CSSValue& end, CSSPropertyID property)
+FilterStyleInterpolation::FilterListStyleInterpolation* FilterStyleInterpolation::maybeCreateList(const CSSValue& start, const CSSValue& end, CSSPropertyID property)
 {
     if (start.isCSSWideKeyword() || end.isCSSWideKeyword())
         return nullptr;
@@ -97,13 +97,13 @@ bool FilterStyleInterpolation::canCreateFrom(const CSSValue& start, const CSSVal
         && startFunctionType != CSSValueDropShadow;
 }
 
-PassOwnPtrWillBeRawPtr<InterpolableValue> FilterStyleInterpolation::toInterpolableValue(const CSSValue& value, CSSValueID& functionType)
+InterpolableValue* FilterStyleInterpolation::toInterpolableValue(const CSSValue& value, CSSValueID& functionType)
 {
     const CSSFunctionValue& filterValue = toCSSFunctionValue(value);
     functionType = filterValue.functionType();
     size_t length = filterValue.length();
 
-    OwnPtrWillBeRawPtr<InterpolableList> result = InterpolableList::create(length);
+    InterpolableList* result = InterpolableList::create(length);
     for (size_t i = 0; i < length; ++i) {
         switch (functionType) {
         case CSSValueHueRotate:
@@ -127,7 +127,7 @@ PassOwnPtrWillBeRawPtr<InterpolableValue> FilterStyleInterpolation::toInterpolab
             ASSERT_NOT_REACHED();
         }
     }
-    return result.release();
+    return result;
 }
 
 PassRefPtrWillBeRawPtr<CSSFunctionValue> FilterStyleInterpolation::fromInterpolableValue(const InterpolableValue& value, CSSValueID functionType, InterpolationRange)