dom test: fix test after change in isolate library.

client/tests/client/dom/IsolatesTest.dart

Index: client/tests/client/dom/IsolatesTest.dart
diff --git a/client/tests/client/dom/IsolatesTest.dart b/client/tests/client/dom/IsolatesTest.dart
index cdd2f7cdab8d94f2f74938ab736a49d211d3429b..a62ca10611f93ce2772b9b8fc1b0c30d100eda9f 100644
--- a/client/tests/client/dom/IsolatesTest.dart
+++ b/client/tests/client/dom/IsolatesTest.dart
@@ -2,9 +2,9 @@
 #import('../../../testing/unittest/unittest.dart');
 #import('dart:dom');
 #import('dart:json');
-#import('dart:isolate');
+#import('dart:isolate', prefix:'isolate');
 
-class PingPongIsolate extends Isolate {
+class PingPongIsolate extends isolate.Isolate {
   PingPongIsolate() : super.heavy();
 
   void main() {
@@ -33,12 +33,12 @@ class PingPongIsolate extends Isolate {
 main() {
   forLayoutTests();
   asyncTest('IsolateSpawn', 1, () {
-    new PingPongIsolate().spawn().then((SendPort port) {
+    new PingPongIsolate().spawn().then((isolate.SendPort port) {
       callbackDone();
     });
   });
   asyncTest('NonDOMIsolates', 1, () {
-    new PingPongIsolate().spawn().then((SendPort port) {
+    new PingPongIsolate().spawn().then((isolate.SendPort port) {
       final msg1 = 'foo';
       final msg2 = 'bar';
       port.call(msg1).receive((response, _) {