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

tests/corelib_2/uri_path_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 "dart:collection";
 
 import "package:expect/expect.dart";
 
 void testInvalidArguments() {}
 
@@ skipping 65 matching lines @@
   var unencoded = new StringBuffer();
   for (int i = 32; i < 128; i++) {
     if (pchar.indexOf(new String.fromCharCode(i)) != -1) {
       encoded.writeCharCode(i);
     } else {
       encoded.write("%");
       encoded.write(i.toRadixString(16).toUpperCase());
     }
     unencoded.writeCharCode(i);
   }
-  encoded = encoded.toString();
-  unencoded = unencoded.toString();
-  test(encoded, [unencoded]);
-  test(encoded + "/" + encoded, [unencoded, unencoded]);
+  var encodedStr = encoded.toString();
+  var unencodedStr = unencoded.toString();
+  test(encodedStr, [unencodedStr]);
+  test(encodedStr + "/" + encodedStr, [unencodedStr, unencodedStr]);
 
   Uri uri;
-  List pathSegments = ["xxx", "yyy", "zzz"];
+  var pathSegments = ["xxx", "yyy", "zzz"];
 
   uri = new Uri(pathSegments: pathSegments);
   Expect.equals(3, uri.pathSegments.length);
   uri = new Uri(pathSegments: pathSegments.where((_) => true));
   Expect.equals(3, uri.pathSegments.length);
   uri = new Uri(pathSegments: new DoubleLinkedQueue.from(pathSegments));
   Expect.equals(3, uri.pathSegments.length);
 
   uri = new Uri(scheme: "http", host: "host", pathSegments: pathSegments);
   Expect.equals(3, uri.pathSegments.length);
@@ skipping 76 matching lines @@
   test(new Uri(pathSegments: ["a", "b"]).pathSegments);
 }
 
 main() {
   testInvalidArguments();
   testPath();
   testPathSegments();
   testPathCompare();
   testPathSegmentsUnmodifiableList();
 }