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

tools/clang/blink_gc_plugin/tests/heap/stubs.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 HEAP_STUBS_H_
 #define HEAP_STUBS_H_
 
 #include "stddef.h"
 
+#define WTF_MAKE_FAST_ALLOCATED                 \
+    public:                                     \
+    void* operator new(size_t, void* p);        \
+    void* operator new[](size_t, void* p);      \
+    void* operator new(size_t size);            \
+    private:                                    \
+    typedef int __thisIsHereToForceASemicolonAfterThisMacro
+
 namespace WTF {
 
 template<typename T> class RefCounted { };
 
 template<typename T> class RawPtr {
 public:
     operator T*() const { return 0; }
     T* operator->() { return 0; }
 };
 
@@ skipping 195 matching lines @@
 namespace WTF {
 
 template<typename T>
 struct VectorTraits<WebCore::Member<T> > {
     static const bool needsDestruction = false;
 };
 
 }
 
 #endif