Blink GC plugin: require that GC derived classes do not override their new(size_t) operator.

tools/clang/blink_gc_plugin/tests/class_overrides_new.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 DESTRUCTOR_IN_NONFINALIZED_CLASS_H_
-#define DESTRUCTOR_IN_NONFINALIZED_CLASS_H_
+#ifndef CLASS_OVERRIDES_NEW_H_
+#define CLASS_OVERRIDES_NEW_H_
 
 #include "heap/stubs.h"
 
 namespace WebCore {
 
 class HeapObject : public GarbageCollected<HeapObject> {
+    WTF_MAKE_FAST_ALLOCATED;
 public:
-    ~HeapObject();
-    void trace(Visitor*);
-private:
-    Member<HeapObject> m_obj;
+    void trace(Visitor*) { }
 };
 
 }
 
 #endif