Fix HTML string methods to not depend on replace method

test/mjsunit/es6/string-html.js

Index: test/mjsunit/es6/string-html.js
diff --git a/test/mjsunit/es6/string-html.js b/test/mjsunit/es6/string-html.js
index 1c63221c9f7ec6b0c8949628f8ebd4bffadffe9d..690830ba841dc641ce6d468c82ceb3cf3d8e31e0 100644
--- a/test/mjsunit/es6/string-html.js
+++ b/test/mjsunit/es6/string-html.js
@@ -192,3 +192,10 @@ assertEquals(String.prototype.sup.length, 0);
     assertEquals(1, calls);
   }
 })();
+
+
+(function TestDeleteStringRelace() {
+  assertEquals('<a name="n">s</a>', 's'.anchor('n'));
+  assertTrue(delete String.prototype.replace);
+  assertEquals('<a name="n">s</a>', 's'.anchor('n'));
+})();