Update Element API for CSSOM smooth scrolling to match the spec

Source/core/html/HTMLSelectElement.h

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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
@@ skipping 83 matching lines @@
 
     void setSize(int);
 
     void setOption(unsigned index, HTMLOptionElement*, ExceptionState&);
     void setLength(unsigned, ExceptionState&);
 
     Element* namedItem(const AtomicString& name);
     HTMLOptionElement* item(unsigned index);
 
     void scrollToSelection();
-    void scrollTo(int listIndex);
+    void scrollToIndex(int listIndex);
 
     void listBoxSelectItem(int listIndex, bool allowMultiplySelections, bool shift, bool fireOnChangeNow = true);
 
     bool canSelectAll() const;
     void selectAll();
     int listToOptionIndex(int listIndex) const;
     void listBoxOnChange();
     int optionToListIndex(int optionIndex) const;
     int activeSelectionStartListIndex() const;
     int activeSelectionEndListIndex() const;
@@ skipping 112 matching lines @@
     bool m_multiple;
     bool m_activeSelectionState;
     mutable bool m_shouldRecalcListItems;
     int m_suggestedIndex;
     bool m_isAutofilledByPreview;
 };
 
 } // namespace blink
 
 #endif // HTMLSelectElement_h