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

pkg/unittest/test/matchers_minified_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 normally fail when run in minified dart2js, since the names will
 // be mangled. This version of the file is modified to expect minified names.
 
 import 'package:unittest/unittest.dart';
 
@@ skipping 34 matching lines @@
           throwsRangeError);
       shouldFail(() { throw new Exception(); },
           throwsRangeError,
           matches(
               r"Expected: throws RangeError +"
               r"Actual: <Closure(: \(\) => dynamic)?> +"
               r"Which: threw " + _minifiedName + r":<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 " + _minifiedName + r":<Exception>"));
     });
 
     test('throwsUnimplementedError', () {
       shouldPass(() { throw new UnimplementedError(''); },
@@ skipping 57 matching lines @@
       shouldFail(w, new HasPrice(greaterThan(10)),
           matches(
               r"Expected: Widget with a price that is a value greater than "
                   r"<10> +"
               r"Actual: <Instance of '" + _minifiedName + r"'> +"
               r"Which: has price with value <10> which is not "
               r"a value greater than <10>"));
     });
   });
 }