unittest step2: bye bye to multiple entrypoints for unittest

client/tests/client/dom/IndexedDB1Test.dart

 #library('IndexedDB1Test');
-#import('../../../../lib/unittest/unittest_dom.dart');
+#import('../../../../lib/unittest/unittest.dart');
+#import('../../../../lib/unittest/dom_config.dart');
 #import('dart:dom');
 
 final String DB_NAME = 'Test';
 final String STORE_NAME = 'TEST';
 final String VERSION = '1';
 
 testReadWrite(key, value, check,
               [dbName = DB_NAME,
                storeName = STORE_NAME,
                version = VERSION]) => () {
@@ skipping 111 matching lines @@
 
 tests_typed() {
   asyncTest('test1', 1, testReadWriteTyped(123, 'Hoot!', Expect.equals));
   asyncTest('test2', 1, testReadWriteTyped(123, 12345, Expect.equals));
   asyncTest('test3', 1, testReadWriteTyped(123, [1,2,3], Expect.listEquals));
   asyncTest('test4', 1,
             testReadWriteTyped(123, const [2, 3, 4], Expect.listEquals));
 }
 
 main() {
-  forLayoutTests();
+  useDomConfiguration();
 
   tests_dynamic();
   tests_typed();
 }