unittest step2: bye bye to multiple entrypoints for unittest

client/tests/client/dom/CrossFrameTest.dart

Index: client/tests/client/dom/CrossFrameTest.dart
diff --git a/client/tests/client/dom/CrossFrameTest.dart b/client/tests/client/dom/CrossFrameTest.dart
index c1e835fe3285eeac6b100eeeaa3be37f23a681c3..ec3fc7760052d1b4bff1b732700336e2e28b451b 100644
--- a/client/tests/client/dom/CrossFrameTest.dart
+++ b/client/tests/client/dom/CrossFrameTest.dart
@@ -1,9 +1,10 @@
 #library('CrossFrameTest');
-#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);
 
   test('contentWindow', () {
       final iframe = document.createElement('iframe');