Use waiter instead of check in EnterpriseEnrollmentConfigurationTest

Bug: 944408
Change-Id: Iaad3ea649321b7a3af37f6ae74b059f005289261
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539997
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Denis Kuznetsov <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644736}
1 file changed