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

Source/core/svg/SVGPathSegList.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 49 matching lines @@
     void clearByteStream() { m_byteStream.clear(); }
 
     // NewSVGListPropertyHelper methods with |m_byteStream| sync:
 
     ItemPropertyType* at(size_t index)
     {
         updateListFromByteStream();
         return Base::at(index);
     }
 
-    size_t numberOfItems()
+    size_t length()
     {
         updateListFromByteStream();
-        return Base::numberOfItems();
+        return Base::length();
     }
 
     bool isEmpty() const
     {
         if (m_listSyncedToByteStream)
             return Base::isEmpty();
 
         return !m_byteStream || m_byteStream->isEmpty();
     }
 
@@ skipping 86 matching lines @@
 inline PassRefPtr<SVGPathSegList> toSVGPathSegList(PassRefPtr<NewSVGPropertyBase> passBase)
 {
     RefPtr<NewSVGPropertyBase> base = passBase;
     ASSERT(base->type() == SVGPathSegList::classType());
     return static_pointer_cast<SVGPathSegList>(base.release());
 }
 
 } // namespace WebCore
 
 #endif