Fix fileapi_test.dart.

tests/html/fileapi_test.dart

 #library('fileapi');
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/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.
 
     test('getDirectory', () {
       expect(() => fs.root.getDirectory('directory1', {'x': true}, (e) {}),
              throws);
 
       fs.root.getDirectory(
           'directory2',
-          flags: {},
+          options: {},
           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},
+          options: {'create': true},
           successCallback: expectAsync1((e) {
             expect(e.name, equals('directory3'));
           }),
           errorCallback: expectAsync1((e) {
             expect(false, 'Got file error: ${e.code}');
           }, count:0));
     });
 
     test('getFile', () {
       expect(() => fs.root.getFile('file1', {'x': true}, (e) {}), throws);
 
       fs.root.getDirectory(
           'file2',
-          flags: {},
+          options: {},
           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},
+          options: {'create': true},
           successCallback: expectAsync1((e) {
             expect(e.name, equals('file3'));
           }),
           errorCallback: expectAsync1((e) {
             expect(false, 'Got file error: ${e.code}');
           }, count:0));
     });
   });
 }