Change the field and constructor parameter types of NoSuchMethodError to Symbol.

pkg/unittest/test/matchers_unminified_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.
 
 // This file is for matcher tests that rely on the names of various Dart types.
 // These tests will fail when run in minified dart2js, since the names will be
 // mangled. A version of this file that works in minified dart2js is in
 // matchers_minified_test.dart.
 
 import 'package:unittest/unittest.dart';
@@ skipping 33 matching lines @@
           throwsRangeError);
       shouldFail(() { throw new Exception(); },
           throwsRangeError,
           matches(
               r"Expected: throws RangeError +"
               r"Actual: <Closure(: \(\) => dynamic)?> +"
               r"Which: threw \?:<Exception>"));
     });
 
     test('throwsNoSuchMethodError', () {
-      shouldPass(() { throw new NoSuchMethodError(null, '', null, null); },
-          throwsNoSuchMethodError);
+      shouldPass(() {
+          throw new NoSuchMethodError(null, const Symbol(''), null, null);
+      }, throwsNoSuchMethodError);
       shouldFail(() { throw new Exception(); },
           throwsNoSuchMethodError,
           matches(
               r"Expected: throws NoSuchMethodError +"
               r"Actual: <Closure(: \(\) => dynamic)?> +"
               r"Which: threw \?:<Exception>"));
     });
 
     test('throwsUnimplementedError', () {
       shouldPass(() { throw new UnimplementedError(''); },
@@ skipping 54 matching lines @@
       shouldPass(w, new HasPrice(10));
       shouldPass(w, new HasPrice(greaterThan(0)));
       shouldFail(w, new HasPrice(greaterThan(10)),
           "Expected: Widget with a price that is a value greater than <10> "
           "Actual: <Instance of 'Widget'> "
           "Which: has price with value <10> which is not "
           "a value greater than <10>");
     });
   });
 }