Oilpan: Enable oilpan for callback classes

Source/modules/filesystem/DirectoryReader.h

Index: Source/modules/filesystem/DirectoryReader.h
diff --git a/Source/modules/filesystem/DirectoryReader.h b/Source/modules/filesystem/DirectoryReader.h
index cdf5261c97bc0d9b2c17d756f176e45942def38e..6e097e12b48f3663dfd7e729a0541d57e8fc0644 100644
--- a/Source/modules/filesystem/DirectoryReader.h
+++ b/Source/modules/filesystem/DirectoryReader.h
@@ -52,7 +52,7 @@ public:
 
     virtual ~DirectoryReader();
 
-    void readEntries(PassOwnPtrWillBeRawPtr<EntriesCallback>, PassOwnPtrWillBeRawPtr<ErrorCallback> = nullptr);
+    void readEntries(EntriesCallback*, ErrorCallback* = nullptr);
 
     DOMFileSystem* filesystem() const { return static_cast<DOMFileSystem*>(m_fileSystem.get()); }
 
@@ -71,8 +71,8 @@ private:
     bool m_isReading;
     EntryHeapVector m_entries;
     RefPtrWillBeMember<FileError> m_error;
-    OwnPtrWillBeMember<EntriesCallback> m_entriesCallback;
-    OwnPtrWillBeMember<ErrorCallback> m_errorCallback;
+    Member<EntriesCallback> m_entriesCallback;
+    Member<ErrorCallback> m_errorCallback;
 };
 
 } // namespace blink