Fix tests that were broken in Chrome.

test/frontend/matcher/throws_test.dart

 // Copyright (c) 2015, 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';
 
 void main() {
   group("synchronous", () {
     group("[throws]", () {
       test("with a function that throws an error", () {
         expect(() => throw 'oh no', throws);
       });
 
       test("with a function that doesn't throw", () {
         return runTest(() {
           expect(() {}, throws);
         }).then((liveTest) {
           expectTestFailed(liveTest,
               "Expected: throws\n"
-              "  Actual: <Closure: () => dynamic>\n"
+              "  Actual: <$closureString>\n"
               "   Which: did not throw\n");
         });
       });
 
       test("with a non-function", () {
         return runTest(() {
           expect(10, throws);
         }).then((liveTest) {
           expectTestFailed(liveTest,
               "Expected: throws\n"
@@ skipping 12 matching lines @@
         expect(() => throw new FormatException("bad"),
             throwsA(isFormatException));
       });
 
       test("with a function that doesn't throw", () {
         return runTest(() {
           expect(() {}, throwsA('oh no'));
         }).then((liveTest) {
           expectTestFailed(liveTest,
               "Expected: throws 'oh no'\n"
-              "  Actual: <Closure: () => dynamic>\n"
+              "  Actual: <$closureString>\n"
               "   Which: did not throw\n");
         });
       });
 
       test("with a non-function", () {
         return runTest(() {
           expect(10, throwsA('oh no'));
         }).then((liveTest) {
           expectTestFailed(liveTest,
               "Expected: throws 'oh no'\n"
               "  Actual: <10>\n"
               "   Which: is not a Function or Future\n");
         });
       });
 
       test("with a function that throws the wrong error", () {
         return runTest(() {
           expect(() => throw 'aw dang', throwsA('oh no'));
         }).then((liveTest) {
           expectTestFailed(liveTest,
               "Expected: throws 'oh no'\n"
-              "  Actual: <Closure: () => dynamic>\n"
+              "  Actual: <$closureString>\n"
               "   Which: threw 'aw dang'\n");
         });
       });
     });
   });
 
   group("asynchronous", () {
     group("[throws]", () {
       test("with a Future that throws an error", () {
         expect(new Future.error('oh no'), throws);
@@ skipping 35 matching lines @@
               "Expected future to fail, but succeeded with 'null'.");
         });
       });
 
       test("with a Future that throws the wrong error", () {
         return runTest(() {
           expect(new Future.error('aw dang'), throwsA('oh no'));
         }).then((liveTest) {
           expectTestFailed(liveTest, startsWith(
               "Expected: throws 'oh no'\n"
-              "  Actual: <Closure: () => dynamic>\n"
+              "  Actual: <$closureString>\n"
               "   Which: threw 'aw dang'\n"));
         });
       });
 
       test("won't let the test end until the Future completes", () {
         return expectTestBlocks(() {
           var completer = new Completer();
           expect(completer.future, throwsA('oh no'));
           return completer;
         }, (completer) => completer.completeError('oh no'));
       });
     });
   });
 }