Revert "Stop suppressing generation of bindings with Promise. Add some tests for DOM APIs that answ…

tests/html/fontface_loaded_test.dart

-library fontface_loaded_test;
-
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
-
-import 'dart:async';
-import 'dart:isolate';
-import 'dart:html';
-
-class NullTreeSanitizer implements NodeTreeSanitizer {
-    void sanitizeTree(Node node) {}
-}
-
-main() {
-  useHtmlConfiguration();
-
-  var style = new Element.html('''
-      <style>
-      @font-face {
-        font-family: 'Ahem';
-        src: url(../../resources/Ahem.ttf);
-        font-style: italic;
-        font-weight: 300;
-        unicode-range: U+0-3FF;
-        font-variant: small-caps;
-        -webkit-font-feature-settings: "dlig" 1;
-        /* font-stretch property is not supported */
-      }
-      </style>
-      ''', treeSanitizer: new NullTreeSanitizer());
-  document.head.append(style);
-
-
-  test('document fonts - temporary', () {
-    var atLeastOneFont = false;
-    document.fonts.forEach((FontFace fontFace, _, __) {
-      atLeastOneFont = true;
-      Future f1 = fontFace.loaded;
-      Future f2 = fontFace.loaded;
-      expect(f1, equals(f2)); // Repeated calls should answer the same Future.
-
-      expect(fontFace.load(), throws);
-    });
-    expect(atLeastOneFont, isTrue);
-  });
-}