Oilpan: Enable oilpan for callback classes

Source/modules/filesystem/DirectoryEntry.h

Index: Source/modules/filesystem/DirectoryEntry.h
diff --git a/Source/modules/filesystem/DirectoryEntry.h b/Source/modules/filesystem/DirectoryEntry.h
index aeeb2203850bb10b738cdd65bf2d9defaae1e669..e45070490cae01197fb016722eab52d4764ef1b1 100644
--- a/Source/modules/filesystem/DirectoryEntry.h
+++ b/Source/modules/filesystem/DirectoryEntry.h
@@ -54,9 +54,9 @@ public:
     virtual bool isDirectory() const OVERRIDE { return true; }
 
     DirectoryReader* createReader();
-    void getFile(const String& path, const Dictionary&, PassOwnPtrWillBeRawPtr<EntryCallback> = nullptr, PassOwnPtrWillBeRawPtr<ErrorCallback> = nullptr);
-    void getDirectory(const String& path, const Dictionary&, PassOwnPtrWillBeRawPtr<EntryCallback> = nullptr, PassOwnPtrWillBeRawPtr<ErrorCallback> = nullptr);
-    void removeRecursively(PassOwnPtrWillBeRawPtr<VoidCallback> successCallback = nullptr, PassOwnPtrWillBeRawPtr<ErrorCallback> = nullptr) const;
+    void getFile(const String& path, const Dictionary&, EntryCallback* = nullptr, ErrorCallback* = nullptr);
+    void getDirectory(const String& path, const Dictionary&, EntryCallback* = nullptr, ErrorCallback* = nullptr);
+    void removeRecursively(VoidCallback* successCallback = nullptr, ErrorCallback* = nullptr) const;
 
     virtual void trace(Visitor*) OVERRIDE;