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

Source/core/svg/SVGStringList.h

Index: Source/core/svg/SVGStringList.h
diff --git a/Source/core/svg/SVGStringList.h b/Source/core/svg/SVGStringList.h
index 946f571e637dd30102948bef0a7e3a91f7ffe264..0e531b964da0d6e217c12c46129b9b42eb19bd44 100644
--- a/Source/core/svg/SVGStringList.h
+++ b/Source/core/svg/SVGStringList.h
@@ -64,7 +64,7 @@ public:
     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&);