Remove invalid sanity check.

In the presence of setUp() it is possible for stuff to be scheduled
by the time integration() is called.

Review URL: https://codereview.chromium.org//12090075

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@17870 260f80e4-7a28-3924-810f-c04153c831b5

test/test_pub.dart

@@ -462,11 +462,6 @@ final _TIMEOUT = 30000;
 /// operations which will be run asynchronously.
 void integration(String description, void body()) {
   test(description, () {
-    // Sanity check. Make sure we cleaned up the last test.
-    assert(_scheduled == null);
-    assert(_scheduledCleanup == null);
-    assert(_scheduledOnException == null);
-
     // Schedule the test.
     body();