Migrate test block 30 + corelib portion of block 31 to Dart 2.0.

tests/corelib_2/uri_normalize_test.dart

 // Copyright (c) 2013, 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.
 
 import "package:expect/expect.dart";
 
 testNormalizePath() {
   test(String expected, String path, {String scheme, String host}) {
     var uri = new Uri(scheme: scheme, host: host, path: path);
     Expect.equals(expected, uri.toString());
@@ skipping 57 matching lines @@
   test("../a/b/c/", "./../a/b/c/");
   test("../a/b/c/", "./../a/b/c/.");
   test("../a/b/c/", "./../a/b/c/z/./..");
   test("/", "/a/..");
   test("./", "a/..");
 }
 
 main() {
   testNormalizePath();
 }