Remove uses of unittest in the HTML tests where possible.

pkg/dev_compiler/test/codegen/lib/html/window_nosuchmethod_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.
 
-library WindowNSMETest;
-import "package:expect/expect.dart";
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
 import 'dart:html' as dom;
 
+import 'package:expect/minitest.dart';
+
 // Not defined in dom.Window.
 foo(x) => x;
 
 class Unused {
   foo(x) => 'not $x';
 }
 
 int inscrutable(int x) => x == 0 ? 0 : x | inscrutable(x & (x - 1));
 
 main() {
-  useHtmlConfiguration();
-  var things = [new Unused(), dom.window];
+  var things = <dynamic>[new Unused(), dom.window];
 
   test('windowNonMethod', () {
       var win = things[inscrutable(1)];
       final message = foo("Hello World");
-      try {
-        String x = win.foo(message);
-        expect(false, isTrue, reason: 'Should not reach here: $x');
-      } on NoSuchMethodError catch (e) {
-        // Expected exception.
-      } on Exception catch (e) {
-        expect(false, isTrue, reason: 'Wrong exception: $e');
-      }
+      expect(() => win.foo(message), throwsNoSuchMethodError);
     });
 
   test('foo', () {
       var win = things[inscrutable(0)];
       String x = win.foo('bar');
       expect(x, 'not bar');
     });
 
-  // Use dom.window direclty in case the compiler does type inference.
+  // Use dom.window directly in case the compiler does type inference.
   test('windowNonMethod2', () {
       final message = foo("Hello World");
-      try {
-        String x = dom.window.foo(message);
-        expect(false, isTrue, reason: 'Should not reach here: $x');
-      } on NoSuchMethodError catch (e) {
-        // Expected exception.
-      } on Exception catch (e) {
-        expect(false, isTrue, reason: 'Wrong exception: $e');
-      }
+      expect(() => (dom.window as dynamic).foo(message),
+          throwsNoSuchMethodError);
     });
 }