Have bindings layer assume and insist that all interface types are GCed.

third_party/WebKit/Source/core/testing/RefCountedScriptWrappable.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef RefCountedScriptWrappable_h
-#define RefCountedScriptWrappable_h
-
-#include "bindings/core/v8/ScriptWrappable.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefCounted.h"
-#include "wtf/text/WTFString.h"
-
-namespace blink {
-
-class RefCountedScriptWrappable : public RefCounted<RefCountedScriptWrappable>, public ScriptWrappable {
-    DEFINE_WRAPPERTYPEINFO();
-public:
-    static PassRefPtr<RefCountedScriptWrappable> create(const String&);
-    virtual ~RefCountedScriptWrappable();
-
-    const String& toString() const { return m_string; }
-
-protected:
-    RefCountedScriptWrappable(const String&);
-
-private:
-    String m_string;
-};
-
-} // namespace blink
-
-#endif // RefCountedScriptWrappable_h