Replace ASSERT and ASSERT_NOT_REACHED in core/style/

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 28 matching lines @@
   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);
+    DCHECK(!m_data);
     m_data = T::create();
   }
 
   bool operator==(const DataRef<T>& o) const {
-    ASSERT(m_data);
-    ASSERT(o.m_data);
+    DCHECK(m_data);
+    DCHECK(o.m_data);
     return m_data == o.m_data || *m_data == *o.m_data;
   }
 
   bool operator!=(const DataRef<T>& o) const {
-    ASSERT(m_data);
-    ASSERT(o.m_data);
+    DCHECK(m_data);
+    DCHECK(o.m_data);
     return m_data != o.m_data && *m_data != *o.m_data;
   }
 
   void operator=(std::nullptr_t) { m_data = nullptr; }
 
  private:
   RefPtr<T> m_data;
 };
 
 }  // namespace blink
 
 #endif  // DataRef_h