[Autofill profile] Reenable a flaky integration test

This CL reenables a (previously) flaky test to collect more evidence
about failures. Since the test got disabled, way better logging of
test failures was introduced.

Bug: 971644
Change-Id: Ibc1b48576c39b204c8e864c09e2947f6560ded82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2000725
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731896}

chrome/browser/sync/test/integration/two_client_autofill_sync_test.cc

@@ -308,9 +308,8 @@ IN_PROC_BROWSER_TEST_F(TwoClientAutofillProfileSyncTest,
 
 // Tests that adding the same profile on the two clients before sync is started
 // results in each client only having one profile after sync is started
-// Flaky on all platform, crbug.com/971644.
 IN_PROC_BROWSER_TEST_F(TwoClientAutofillProfileSyncTest,
-                       DISABLED_ClientsAddSameProfile) {
+                       ClientsAddSameProfile) {
   ASSERT_TRUE(SetupClients()) << "SetupClients() failed";
   base::HistogramTester histograms;