Oilpan: have Storage objects reside on the heap by default.

Source/modules/storage/StorageArea.h

Index: Source/modules/storage/StorageArea.h
diff --git a/Source/modules/storage/StorageArea.h b/Source/modules/storage/StorageArea.h
index ddfc488b316fee8e6582fb4c1d2c8cd69de7549a..64157534509d95333360bece5597dffd78251be5 100644
--- a/Source/modules/storage/StorageArea.h
+++ b/Source/modules/storage/StorageArea.h
@@ -48,10 +48,10 @@ enum StorageType {
     SessionStorage
 };
 
-class MODULES_EXPORT StorageArea final : public NoBaseWillBeGarbageCollectedFinalized<StorageArea>, public LocalFrameLifecycleObserver {
+class MODULES_EXPORT StorageArea final : public GarbageCollectedFinalized<StorageArea>, public LocalFrameLifecycleObserver {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(StorageArea);
 public:
-    static PassOwnPtrWillBeRawPtr<StorageArea> create(PassOwnPtr<WebStorageArea>, StorageType);
+    static StorageArea* create(PassOwnPtr<WebStorageArea>, StorageType);
 
     virtual ~StorageArea();