Wait for  description propagation in TwoClientPrintersSyncTest.ConflictResolution.

Previously, the test ran all pending tasks, waited for all stores to be
equal, and then verified that the printer description was equal in all
stores.

It is better practice not to wait for all pending tasks to run, and
instead wait for the specific condition that we want to verify.

Bug: 810408
Change-Id: Ifa5fe80368285786664498991c82c1ccdecb5072
Reviewed-on: https://chromium-review.googlesource.com/1003224
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: Nicolas Zea (slow) <zea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549522}
1 file changed