More String + elimination in tests

tests/isolate/v2_unresolved_ports_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.
 
 // spawns multiple isolates and sends unresolved ports between them.
 #library('unresolved_ports');
 #import('dart:isolate');
 #import('../../lib/unittest/unittest.dart');
 
 // This test does the following:
@@ skipping 17 matching lines @@
 bobIsolate() {
   port.receive((msg, reply) => reply.send(
         '$msg\nBob says: we are all coming!'));
 }
 
 main() {
   test('Message chain with unresolved ports', () {
     ReceivePort port = new ReceivePort();
     port.receive(expectAsync2((msg, _) {
       expect(msg).equals('main says: Beth, find out if Tim is coming.'
-        + '\nBeth says: Tim are you coming? And Bob?'
-        + '\nTim says: Can you tell "main" that we are all coming?'
-        + '\nBob says: we are all coming!');
+        '\nBeth says: Tim are you coming? And Bob?'
+        '\nTim says: Can you tell "main" that we are all coming?'
+        '\nBob says: we are all coming!');
       port.close();
     }));
 
     SendPort tim = spawnFunction(timIsolate);
     SendPort beth = spawnFunction(bethIsolate);
 
     beth.send(
         // because tim is created asynchronously, here we are sending an
         // unresolved port:
         ['main says: Beth, find out if Tim is coming.', tim],
         port.toSendPort());
   });
 }