debugging for crbug.com/646539

third_party/WebKit/Source/core/style/DataRef.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 21 matching lines @@
 template <typename T> class DataRef {
     USING_FAST_MALLOC(DataRef);
 public:
     const T* get() const { return m_data.get(); }
 
     const T& operator*() const { return *get(); }
     const T* operator->() const { return get(); }
 
     T* access()
     {
-        if (!m_data->hasOneRef())
-            m_data = m_data->copy();
         return m_data.get();
     }
 
     void init()
     {
         ASSERT(!m_data);
         m_data = T::create();
     }
 
     bool operator==(const DataRef<T>& o) const
@@ skipping 11 matching lines @@
     }
 
     void operator=(std::nullptr_t) { m_data = nullptr; }
 private:
     RefPtr<T> m_data;
 };
 
 } // namespace blink
 
 #endif // DataRef_h