Some unit test fixes

tests/html/fileapi_test.dart

 #library('fileapi');
 #import('../../lib/unittest/unittest.dart');
 #import('../../lib/unittest/html_config.dart');
 #import('dart:html');
 
 main() {
   useHtmlConfiguration();
   window.webkitRequestFileSystem(Window.TEMPORARY, 100, (fs) {
     // FIXME: add types to callback arguments after migration to wrapperless dart:html.
-    asyncTest('getDirectory', 2, () {
-      Expect.throws(() => fs.root.getDirectory('directory1', {'x': true}, (e) {}));
+
+    test('getDirectory', () {
+      expect(() => fs.root.getDirectory('directory1', {'x': true}, (e) {}),
+             throws);
 
       fs.root.getDirectory(
           'directory2',
           flags: {},
-          successCallback: (e) {
-            Expect.fail('Should not be reached');
-            callbackDone();
-          },
-          errorCallback: (e) {
-            Expect.equals(FileError.NOT_FOUND_ERR, e.code);
-            callbackDone();
-          });
+          successCallback: expectAsync1((e) {
+            expect(false, 'Should not be reached');
+          }, count:0),
+          errorCallback: expectAsync1((e) {
+            expect(e.code, equals(FileError.NOT_FOUND_ERR));
+          }));
 
       fs.root.getDirectory(
           'directory3',
           flags: {'create': true},
-          successCallback: (e) {
-            Expect.equals('directory3', e.name);
-            callbackDone();
-          },
-          errorCallback: (e) {
-            Expect.fail('Got file error: ${e.code}');
-            callbackDone();
-          });
+          successCallback: expectAsync1((e) {
+            expect(e.name, equals('directory3'));
+          }),
+          errorCallback: expectAsync1((e) {
+            expect(false, 'Got file error: ${e.code}');
+          }, count:0));
     });
 
-    asyncTest('getFile', 2, () {
-      Expect.throws(() => fs.root.getFile('file1', {'x': true}, (e) {}));
+    test('getFile', () {
+      expect(() => fs.root.getFile('file1', {'x': true}, (e) {}), throws);
 
       fs.root.getDirectory(
           'file2',
           flags: {},
-          successCallback: (e) {
-            Expect.fail('Should not be reached');
-            callbackDone();
-          },
-          errorCallback: (e) {
-            Expect.equals(FileError.NOT_FOUND_ERR, e.code);
-            callbackDone();
-          });
+          successCallback: expectAsync1((e) {
+            expect(false, 'Should not be reached');
+          }, count:0),
+          errorCallback: expectAsync1((e) {
+            expect(e.code, equals(FileError.NOT_FOUND_ERR));
+          }));
 
       fs.root.getDirectory(
           'file3',
           flags: {'create': true},
-          successCallback: (e) {
-            Expect.equals('file3', e.name);
-            callbackDone();
-          },
-          errorCallback: (e) {
-            Expect.fail('Got file error: ${e.code}');
-            callbackDone();
-          });
+          successCallback: expectAsync1((e) {
+            expect(e.name, equals('file3'));
+          }),
+          errorCallback: expectAsync1((e) {
+            expect(false, 'Got file error: ${e.code}');
+          }, count:0));
     });
   });
 }