Oilpan: Enable oilpan for callback classes

Source/modules/filesystem/FileEntry.h

Index: Source/modules/filesystem/FileEntry.h
diff --git a/Source/modules/filesystem/FileEntry.h b/Source/modules/filesystem/FileEntry.h
index 9ba26d7d3f2a9a4bda9dfd762812949b3b4e19f3..1186de733e391becf77d6792c373bd2f09a08f4c 100644
--- a/Source/modules/filesystem/FileEntry.h
+++ b/Source/modules/filesystem/FileEntry.h
@@ -48,8 +48,8 @@ public:
         return new FileEntry(fileSystem, fullPath);
     }
 
-    void createWriter(PassOwnPtrWillBeRawPtr<FileWriterCallback>, PassOwnPtrWillBeRawPtr<ErrorCallback> = nullptr);
-    void file(PassOwnPtrWillBeRawPtr<FileCallback>, PassOwnPtrWillBeRawPtr<ErrorCallback> = nullptr);
+    void createWriter(FileWriterCallback*, ErrorCallback* = nullptr);
+    void file(FileCallback*, ErrorCallback* = nullptr);
 
     virtual bool isFile() const OVERRIDE { return true; }