unittest step2: bye bye to multiple entrypoints for unittest

client/tests/client/dom/IndexedDB2Test.dart

 #library('IndexedDB1Test');
-#import('../../../../lib/unittest/unittest_dom.dart');
+#import('../../../../lib/unittest/unittest.dart');
+#import('../../../../lib/unittest/dom_config.dart');
 #import('dart:dom');
 #import('dart:coreimpl');
 
 // Write and re-read Maps: simple Maps; Maps with DAGs; Maps with cycles.
 
 final String DB_NAME = 'Test';
 final String STORE_NAME = 'TEST';
 final String VERSION = '1';
 
 testReadWrite(key, value, check,
@@ skipping 125 matching lines @@
   obj4['a'] = 100;
   obj4['b'] = 's';
 
   asyncTest('test_simple', 1, testReadWrite(123, obj1, verifyGraph));
   asyncTest('test_DAG', 1, testReadWrite(123, obj2, verifyGraph));
   asyncTest('test_cycle', 1, testReadWrite(123, obj3, verifyGraph));
   asyncTest('test_simple_splay', 1, testReadWrite(123, obj4, verifyGraph));
 }
 
 main() {
-  forLayoutTests();
+  useDomConfiguration(isLayoutTest: true);
 
   tests_dynamic();
 }