Modified unittest to use new argument syntax.

tests/html/fileapi_test.dart

 #library('fileapi');
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 
 void fail(message) {
   guardAsync(() {
-    Expect.fail(message);
+    expect(false, isTrue, reason: message);
   });
 }
 
 DOMFileSystem fs;
 
 main() {
   useHtmlConfiguration();
   test('getFileSystem', () {
     window.webkitRequestFileSystem(LocalWindow.TEMPORARY, 100, expectAsync1(
       (DOMFileSystem fileSystem) {
@@ skipping 43 matching lines @@
             expect(e.code, equals(FileError.NOT_FOUND_ERR));
           }));
     });
 
     test('fileCreate', () {
       fs.root.getFile(
           'file4',
           options: {'create': true},
           successCallback: expectAsync1((FileEntry e) {
             expect(e.name, equals('file4'));
-            expect(e.isFile, equals(true));
+            expect(e.isFile, isTrue);
           }),
           errorCallback: (e) {
             fail('Got file error: ${e.code}');
           });
       });
   });
 }