Migrate dom tests to dart:html.

tests/dom/document_test.dart

 #library('DocumentTest');
 #import('../../lib/unittest/unittest.dart');
-#import('../../lib/unittest/dom_config.dart');
-#import('dart:dom');
+#import('../../lib/unittest/html_config.dart');
+#import('dart:html');
 
 main() {
-  useDomConfiguration();
+  useHtmlConfiguration();
 
   test('CreateElement', () {
     // FIXME: nifty way crashes, do it boring way.
-    Expect.isTrue(document.createElement('span') is HTMLElement);
-    Expect.isTrue(document.createElement('div') is HTMLDivElement);
-    Expect.isTrue(document.createElement('a') is HTMLAnchorElement);
-    Expect.isTrue(document.createElement('bad_name') is HTMLUnknownElement);
-  });
-
-  test('DocumentURL', () {
-    // URL is something like ..._client_dom_DocumentTest.dartfrogium.html
-    Expect.isTrue(document.URL.endsWith('.html'));
-    Expect.isTrue(document.URL.indexOf('document_test') > 0);
+    Expect.isTrue(new Element.tag('span') is Element);
+    Expect.isTrue(new Element.tag('div') is DivElement);
+    Expect.isTrue(new Element.tag('a') is AnchorElement);
+    Expect.isTrue(new Element.tag('bad_name') is UnknownElement);
   });
 }