Oilpan: Enable oilpan for callback classes

Source/bindings/templates/callback_interface.h

Index: Source/bindings/templates/callback_interface.h
diff --git a/Source/bindings/templates/callback_interface.h b/Source/bindings/templates/callback_interface.h
index bab148a7d4626c4fc71dbd44ef73b03eda5b77d3..41b631e909e4eeb9279f0c505f253e3c8ea70149 100644
--- a/Source/bindings/templates/callback_interface.h
+++ b/Source/bindings/templates/callback_interface.h
@@ -16,9 +16,9 @@ namespace blink {
 
 class {{v8_class}} FINAL : public {{cpp_class}}, public ActiveDOMCallback {
 public:
-    static PassOwnPtrWillBeRawPtr<{{v8_class}}> create(v8::Handle<v8::Function> callback, ScriptState* scriptState)
+    static {{v8_class}}* create(v8::Handle<v8::Function> callback, ScriptState* scriptState)
     {
-        return adoptPtrWillBeNoop(new {{v8_class}}(callback, scriptState));
+        return new {{v8_class}}(callback, scriptState);
     }
 
     virtual ~{{v8_class}}();