Migrate dom tests to dart:html.

client/tests/client/dom/PerformanceApiTest.dart

Index: client/tests/client/dom/PerformanceApiTest.dart
diff --git a/client/tests/client/dom/PerformanceApiTest.dart b/client/tests/client/dom/PerformanceApiTest.dart
index e5d1e689e262dc640700aa575053f2d2f82bc757..6a660923a6277bb8542f99787a1786ae73a51c88 100644
--- a/client/tests/client/dom/PerformanceApiTest.dart
+++ b/client/tests/client/dom/PerformanceApiTest.dart
@@ -1,10 +1,10 @@
 #library('PerformanceApiTest');
 #import('../../../../lib/unittest/unittest.dart');
-#import('../../../../lib/unittest/dom_config.dart');
-#import('dart:dom');
+#import('../../../../lib/unittest/html_config.dart');
+#import('dart:html');
 
 main() {
-  useDomConfiguration();
+  useHtmlConfiguration();
   test('PerformanceApi', () {
     // Check that code below will not throw exceptions.
     var requestStart = window.performance.timing.requestStart;