Update unittest to new package layout.

tests/isolate/mint_maker_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Things that should be "auto-generated" are between AUTO START and
 // AUTO END (or just AUTO if it's a single line).
 
 #library("MintMakerTest");
 #import("dart:isolate");
-#import('../../pkg/unittest/unittest.dart');
+#import('../../pkg/unittest/lib/unittest.dart');
 
 class Mint {
   Mint() : registry_ = new Map<SendPort, Purse>() {
     // AUTO START
     ReceivePort mintPort = new ReceivePort();
     port = mintPort.toSendPort();
     serveMint(mintPort);
     // AUTO END
   }
 
@@ skipping 231 matching lines @@
     sprouted...deposit(purse, 5);
     Expect.equals(0 + 5, sprouted.queryBalance());
     Expect.equals(100 - 5, purse.queryBalance());
 
     sprouted...deposit(purse, 42);
     Expect.equals(0 + 5 + 42, sprouted.queryBalance());
     Expect.equals(100 - 5 - 42, purse.queryBalance());
   }
   */
 }