Remove redefinitions of ExceptionCode.

third_party/WebKit/Source/core/html/ClassList.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 #include "core/HTMLNames.h"
 #include "core/dom/DOMTokenList.h"
 #include "core/dom/Element.h"
 #include "core/dom/SpaceSplitString.h"
 #include <memory>
 
 namespace blink {
 
 class Element;
 
-typedef int ExceptionCode;
-
 class ClassList final : public DOMTokenList {
  public:
   static ClassList* create(Element* element) { return new ClassList(element); }
 
   unsigned length() const override;
   const AtomicString item(unsigned index) const override;
 
   Element* element() override { return m_element; }
 
   void clearValueForQuirksMode() { m_classNamesForQuirksMode = nullptr; }
@@ skipping 14 matching lines @@
     m_element->setAttribute(HTMLNames::classAttr, value);
   }
 
   Member<Element> m_element;
   mutable std::unique_ptr<SpaceSplitString> m_classNamesForQuirksMode;
 };
 
 }  // namespace blink
 
 #endif  // ClassList_h