Logging tweak for sync integration test harness

chrome/test/live_sync/many_client_live_preferences_sync_test.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/test/live_sync/live_preferences_sync_test.h"
 
 IN_PROC_BROWSER_TEST_F(ManyClientLivePreferencesSyncTest, Sanity) {
   ASSERT_TRUE(SetupSync()) << "SetupSync() failed.";
 
   bool new_value = !GetVerifierPrefs()->GetBoolean(
       prefs::kHomePageIsNewTabPage);
   GetVerifierPrefs()->SetBoolean(prefs::kHomePageIsNewTabPage, new_value);
   GetPrefs(0)->SetBoolean(prefs::kHomePageIsNewTabPage, new_value);
 
-  GetClient(0)->AwaitGroupSyncCycleCompletion(clients());
+  ASSERT_TRUE(GetClient(0)->AwaitGroupSyncCycleCompletion(clients()));
 
   for (int i = 0; i < num_clients(); ++i) {
     ASSERT_EQ(GetVerifierPrefs()->GetBoolean(prefs::kHomePageIsNewTabPage),
         GetPrefs(i)->GetBoolean(prefs::kHomePageIsNewTabPage));
   }
 }