Fix tests that were broken in Chrome.

test/frontend/matcher/prints_test.dart

 // Copyright (c) 2014, 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 'package:unittest/unittest.dart';
 
 import '../../utils.dart';
 
@@ skipping 14 matching lines @@
       expect(() => print("Hello, world!"), prints(contains("Hello")));
     });
 
     test("describes a failure nicely", () {
       return runTest(() {
         expect(() => print("Hello, world!"), prints("Goodbye, world!\n"));
       }).then((liveTest) {
         expectTestFailed(liveTest,
             "Expected: prints 'Goodbye, world!\\n'\n"
             "  ''\n"
-            "  Actual: <Closure: () => dynamic>\n"
+            "  Actual: <$closureString>\n"
             "   Which: printed 'Hello, world!\\n'\n"
             "  ''\n"
             "   Which: is different.\n"
             "Expected: Goodbye, w ...\n"
             "  Actual: Hello, wor ...\n"
             "          ^\n"
             " Differ at offset 0\n");
       });
     });
 
     test("describes a failure with a non-descriptive Matcher nicely", () {
       return runTest(() {
         expect(() => print("Hello, world!"), prints(contains("Goodbye")));
       }).then((liveTest) {
         expectTestFailed(liveTest,
             "Expected: prints contains 'Goodbye'\n"
-            "  Actual: <Closure: () => dynamic>\n"
+            "  Actual: <$closureString>\n"
             "   Which: printed 'Hello, world!\\n'\n"
             "  ''\n");
       });
     });
 
     test("describes a failure with no text nicely", () {
       return runTest(() {
         expect(() {}, prints(contains("Goodbye")));
       }).then((liveTest) {
         expectTestFailed(liveTest,
             "Expected: prints contains 'Goodbye'\n"
-            "  Actual: <Closure: () => dynamic>\n"
+            "  Actual: <$closureString>\n"
             "   Which: printed nothing.\n");
       });
     });
 
     test("with a non-function", () {
       return runTest(() {
         expect(10, prints(contains("Goodbye")));
       }).then((liveTest) {
         expectTestFailed(liveTest,
             "Expected: prints contains 'Goodbye'\n"
@@ skipping 21 matching lines @@
     });
 
     test("describes a failure nicely", () {
       return runTest(() {
         expect(() => new Future(() => print("Hello, world!")),
             prints("Goodbye, world!\n"));
       }).then((liveTest) {
         expectTestFailed(liveTest, startsWith(
             "Expected: prints 'Goodbye, world!\\n'\n"
             "  ''\n"
-            "  Actual: <Closure: () => dynamic>\n"
+            "  Actual: <$closureString>\n"
             "   Which: printed 'Hello, world!\\n'\n"
             "  ''\n"
             "   Which: is different.\n"
             "Expected: Goodbye, w ...\n"
             "  Actual: Hello, wor ...\n"
             "          ^\n"
             " Differ at offset 0"));
       });
     });
 
     test("describes a failure with a non-descriptive Matcher nicely", () {
       return runTest(() {
         expect(() => new Future(() => print("Hello, world!")),
             prints(contains("Goodbye")));
       }).then((liveTest) {
         expectTestFailed(liveTest, startsWith(
             "Expected: prints contains 'Goodbye'\n"
-            "  Actual: <Closure: () => dynamic>\n"
+            "  Actual: <$closureString>\n"
             "   Which: printed 'Hello, world!\\n'\n"
             "  ''"));
       });
     });
 
     test("describes a failure with no text nicely", () {
       return runTest(() {
         expect(() => new Future.value(), prints(contains("Goodbye")));
       }).then((liveTest) {
         expectTestFailed(liveTest, startsWith(
             "Expected: prints contains 'Goodbye'\n"
-            "  Actual: <Closure: () => dynamic>\n"
+            "  Actual: <$closureString>\n"
             "   Which: printed nothing."));
       });
     });
 
     test("won't let the test end until the Future completes", () {
       return expectTestBlocks(() {
         var completer = new Completer();
         expect(() => completer.future, prints(isEmpty));
         return completer;
       }, (completer) => completer.complete());
     });
   });
 }