Move more methods to the new interceptor scheme

tests/corelib/string_test.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // TODO(ngeoffray): test String methods with null arguments.
 class StringTest {
 
   static testMain() {
     testOutOfRange();
     testIllegalArgument();
@@ skipping 175 matching lines @@
     Expect.equals(4, "strstr".lastIndexOf("t", 5));
     Expect.equals(4, "strstr".lastIndexOf("tr", 5));
     Expect.equals(3, "strstr".lastIndexOf("str", 5));
     Expect.equals(3, "strstr".lastIndexOf("str", 5));
     Expect.equals(3, "strstr".lastIndexOf("str", 5));
     Expect.equals(3, "strstr".lastIndexOf("st", 5));
     Expect.equals(3, "strstr".lastIndexOf("s", 5));
     Expect.equals(5, "strstr".lastIndexOf("r", 5));
     Expect.equals(2, "strstr".lastIndexOf("r", 4));
     Expect.equals(2, "strstr".lastIndexOf("r", 3));
+    Expect.equals(5, "strstr".lastIndexOf("r"));
+    Expect.equals(5, "strstr".lastIndexOf("r"), null);
 
     String str = "hello";
     for (int i = 0; i < 10; i++) {
       int result = str.lastIndexOf("", i);
       if (i > str.length) {
         Expect.equals(str.length, result);
       } else {
         Expect.equals(i, result);
       }
     }
@@ skipping 86 matching lines @@
     }
     test("abc");
     test("");
     test(" ");
   }
 }
 
 main() {
   StringTest.testMain();
 }