unittest step2: bye bye to multiple entrypoints for unittest

client/tests/client/dom/XHRTest.dart

Index: client/tests/client/dom/XHRTest.dart
diff --git a/client/tests/client/dom/XHRTest.dart b/client/tests/client/dom/XHRTest.dart
index f8089d9a7d79e7d36899bda1767ca354fac2fc64..0c64a52201caea6d1d0445d281c3e93d621c95e2 100644
--- a/client/tests/client/dom/XHRTest.dart
+++ b/client/tests/client/dom/XHRTest.dart
@@ -1,9 +1,10 @@
 #library('XHRTest');
-#import('../../../../lib/unittest/unittest_dom.dart');
+#import('../../../../lib/unittest/unittest.dart');
+#import('../../../../lib/unittest/dom_config.dart');
 #import('dart:dom');
 
 main() {
-  forLayoutTests();
+  useDomConfiguration(isLayoutTest: true);
   asyncTest('XHR', 1, () {
     XMLHttpRequest xhr = new XMLHttpRequest();
     // TODO: figure out how to place a resource file with fixed name alongside