Copy lib/dom tests that use dart:html to lib/html.

tests/dom/history_test.dart

-#library('HistoryTest');
-#import('../../lib/unittest/unittest.dart');
-#import('../../lib/unittest/html_config.dart');
-#import('dart:html');
-
-main() {
-  useHtmlConfiguration();
-  test('History', () {
-    window.history.pushState(null, document.title, '?foo=bar');
-    expect(window.history.length).equals(2);
-    window.history.back();
-    expect(window.location.href.endsWith('foo=bar')).isTrue();
-
-    window.history.replaceState(null, document.title, '?foo=baz');
-    Expect.equals(2, window.history.length);
-    expect(window.location.href.endsWith('foo=baz')).isTrue();
-  });
-}