test renaming overhaul: step 4 client tests

tests/dom/isolates_test.dart

 #library('IsolatesTest');
-#import('../../../../lib/unittest/unittest.dart');
-#import('../../../../lib/unittest/dom_config.dart');
+#import('../../lib/unittest/unittest.dart');
+#import('../../lib/unittest/dom_config.dart');
 #import('dart:dom');
 #import('dart:json');
 #import('dart:isolate', prefix:'isolate');
 
 class PingPongIsolate extends isolate.Isolate {
   PingPongIsolate() : super.heavy();
 
   void main() {
     bool wasThrown = false;
     try {
@@ skipping 31 matching lines @@
       port.call(msg1).then((response) {
         Expect.equals(PingPongIsolate.responseFor(msg1), response);
         port.call(msg2).then((response) {
           Expect.equals(PingPongIsolate.responseFor(msg2), response);
           callbackDone();
         });
       });
     });
   });
 }