Replace raw pointers to GC allocated objects by members in stack allocated objects.

Source/modules/filesystem/SyncCallbackHelper.h

Index: Source/modules/filesystem/SyncCallbackHelper.h
diff --git a/Source/modules/filesystem/SyncCallbackHelper.h b/Source/modules/filesystem/SyncCallbackHelper.h
index 00aa746fdb46ad018c409f1e581b181bca07b13f..c73da5f68aab9f4251473c3a4571ec81ffb121e3 100644
--- a/Source/modules/filesystem/SyncCallbackHelper.h
+++ b/Source/modules/filesystem/SyncCallbackHelper.h
@@ -54,7 +54,7 @@ struct HelperResultType {
     DISALLOW_ALLOCATION();
 public:
     typedef PassRefPtrWillBeRawPtr<ResultType> ReturnType;
-    typedef RefPtrWillBeRawPtr<ResultType> StorageType;
+    typedef RefPtrWillBeMember<ResultType> StorageType;
 
     static ReturnType createFromCallbackArg(CallbackArg argument)
     {
@@ -154,7 +154,7 @@ private:
     bool m_completed;
 };
 
-struct EmptyType : public RefCounted<EmptyType> {
+struct EmptyType : public RefCountedWillBeGarbageCollected<EmptyType> {
     static PassRefPtrWillBeRawPtr<EmptyType> create(EmptyType*)
     {
         return nullptr;