bindings: Retires ScriptWrappable::init, etc.

Source/core/testing/GarbageCollectedScriptWrappable.cpp

 // 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.
 
 #include "config.h"
 #include "core/testing/GarbageCollectedScriptWrappable.h"
 
 namespace blink {
 
 GarbageCollectedScriptWrappable::GarbageCollectedScriptWrappable(const String& string)
     : m_string(string)
 {
-    ScriptWrappable::init(this);
 }
 
 GarbageCollectedScriptWrappable::~GarbageCollectedScriptWrappable()
 {
 }
 
 } // namespace blink