[SVG2] Add getters and setters to SVG*List interfaces.

Source/core/svg/SVGStringList.h

 /*
  * Copyright (C) 2014 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 46 matching lines @@
     static PassRefPtr<SVGStringList> create()
     {
         return adoptRef(new SVGStringList());
     }
 
     virtual ~SVGStringList();
 
     const Vector<String>& values() const { return m_values; }
 
     // SVGStringList DOM Spec implementation. These are only to be called from SVGStringListTearOff:
-    unsigned long numberOfItems() { return m_values.size(); }
+    unsigned long length() { return m_values.size(); }
     void clear() { m_values.clear(); }
     void initialize(const String&);
     String getItem(size_t, ExceptionState&);
     void insertItemBefore(const String&, size_t);
     String removeItem(size_t, ExceptionState&);
     void appendItem(const String&);
     void replaceItem(const String&, size_t, ExceptionState&);
 
     // NewSVGPropertyBase:
     PassRefPtr<SVGStringList> clone();
@@ skipping 13 matching lines @@
     template <typename CharType>
     void parseInternal(const CharType*& ptr, const CharType* end);
     bool checkIndexBound(size_t, ExceptionState&);
 
     Vector<String> m_values;
 };
 
 } // namespace WebCore
 
 #endif // SVGStringList_h