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

tests/dom/xhr_test.dart

Index: tests/dom/xhr_test.dart
diff --git a/tests/dom/xhr_test.dart b/tests/dom/xhr_test.dart
deleted file mode 100644
index d1e5921fb7c1f37c7cccc17ef46f0286ff84f724..0000000000000000000000000000000000000000
--- a/tests/dom/xhr_test.dart
+++ /dev/null
@@ -1,22 +0,0 @@
-#library('XHRTest');
-#import('../../lib/unittest/unittest.dart');
-#import('../../lib/unittest/html_config.dart');
-#import('dart:html');
-
-main() {
-  useHtmlConfiguration();
-  asyncTest('XHR', 1, () {
-    XMLHttpRequest xhr = new XMLHttpRequest();
-    // TODO: figure out how to place a resource file with fixed name alongside
-    // the .html file.
-    xhr.open('GET', 'MISSING-FILE', true);
-    xhr.on.readyStateChange.add((event) {
-        if (xhr.readyState == 4) {
-          Expect.equals(0, xhr.status);
-          Expect.stringEquals('', xhr.responseText);
-          callbackDone();
-        }
-      }, true);
-    xhr.send();
-  });
-}