this fake renderer needs an eraseFeatures method - thanks pgiraud for catching this

git-svn-id: http://svn.openlayers.org/trunk/openlayers@5388 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/Layer/test_Vector.html

@@ -79,7 +79,8 @@
                 f = feature;
                 s = style;
             },
-            destroy: function() { }
+            destroy: function() { },
+            eraseFeatures: function() {}
         };