Track some changes to reference types (mostly Blink types moving to Oilpan).

Source/bindings/dart/scripts/templates/callback_interface_h.template

 // Copyright 2014 The Dartium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file has been auto-generated by {{code_generator_dart}}. DO NOT MODIFY!
 
 #ifndef {{dart_class}}_h
 #define {{dart_class}}_h
 
 {% filter conditional(conditional_string) %}
 {% for filename in header_includes %}
 #include "{{filename}}"
 {% endfor %}
 
 namespace blink {
 
 class {{dart_class}} : public {{cpp_class}}, public ActiveDOMCallback {
 public:
     typedef {{dart_class}} NativeType;
 
-    static PassOwnPtr<NativeType> create(Dart_Handle object, Dart_Handle& exception)
+    static NativeType* create(Dart_Handle object, Dart_Handle& exception)
     {
-        return adoptPtr(new {{dart_class}}(object, exception, DartUtilities::scriptExecutionContext()));
+        return new {{dart_class}}(object, exception, DartUtilities::scriptExecutionContext());
     }
 
-    static PassOwnPtr<NativeType> createWithNullCheck(Dart_Handle object, Dart_Handle& exception)
+    static NativeType* createWithNullCheck(Dart_Handle object, Dart_Handle& exception)
     {
         if (Dart_IsNull(object))
-            return PassOwnPtr<NativeType>();
+            return nullptr;
         return create(object, exception);
     }
 
-    static PassOwnPtr<NativeType> create(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+    static NativeType* create(Dart_NativeArguments args, int idx, Dart_Handle& exception)
     {
         Dart_Handle object = Dart_GetNativeArgument(args, idx);
         return create(object, exception);
     }
 
-    static PassOwnPtr<NativeType> createWithNullCheck(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+    static NativeType* createWithNullCheck(Dart_NativeArguments args, int idx, Dart_Handle& exception)
     {
         Dart_Handle object = Dart_GetNativeArgument(args, idx);
         if (Dart_IsNull(object))
-            return PassOwnPtr<NativeType>();
+            return nullptr;
         return create(object, exception);
     }
 
 {% for method in methods %}
     virtual {{method.cpp_type}} {{method.name}}({{method.argument_declarations | join(', ')}}) OVERRIDE;
 {% endfor %}
 private:
     {{dart_class}}(Dart_Handle object, Dart_Handle& exception, ExecutionContext* context)
         : ActiveDOMCallback(context)
         , m_callback(object, exception)
     {
     }
 
     DartCallback m_callback;
 };
 
 }
 {% endfilter %}
 #endif // {{dart_class}}_h