Rename new Uri.fromString to Uri.parse.

tests/standalone/io/regress_7097_test.dart

 // Copyright (c) 2012, 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:async';
 import 'dart:io';
 import 'dart:uri';
 
 void main() {
   var client = new HttpClient();
@@ skipping 21 matching lines @@
         default:
           Expect.fail("Unexpected state");
       }
       response.outputStream.close();
     };
   };
   server.listen('127.0.0.1', 0);
 
   Future makeRequest(int n) {
     var completer = new Completer();
-    var url = new Uri.fromString("http://localhost:${server.port}");
+    var url = Uri.parse("http://localhost:${server.port}");
     var connection = client.openUrl("POST", url);
     connection.onRequest = (HttpClientRequest request) {
       request.contentLength = n + 1;
       switch (n) {
         case 0:
           request.outputStream.writeFrom([65, 66, 67], 1, 1);
           break;
         case 1:
           request.outputStream.writeFrom([65, 66, 67], 1);
           break;
@@ skipping 20 matching lines @@
 
   makeRequest(0).then((_) {
     makeRequest(1).then((_) {
       makeRequest(2).then((_) {
         client.shutdown();
         server.close();
       });
     });
   });
 }