[Sync] Refactoring of sync integration test checkers to remove boilerplate await methods.

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

 // Copyright (c) 2012 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 "base/macros.h"
 #include "chrome/browser/sync/test/integration/search_engines_helper.h"
-#include "chrome/browser/sync/test/integration/sync_integration_test_util.h"
 #include "chrome/browser/sync/test/integration/sync_test.h"
+#include "chrome/browser/sync/test/integration/updated_progress_marker_checker.h"
 #include "components/browser_sync/profile_sync_service.h"
 #include "components/search_engines/template_url_service.h"
 
-using sync_integration_test_util::AwaitCommitActivityCompletion;
-
 class SingleClientSearchEnginesSyncTest : public SyncTest {
  public:
   SingleClientSearchEnginesSyncTest() : SyncTest(SINGLE_CLIENT) {}
   ~SingleClientSearchEnginesSyncTest() override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SingleClientSearchEnginesSyncTest);
 };
 
 IN_PROC_BROWSER_TEST_F(SingleClientSearchEnginesSyncTest, Sanity) {
   ASSERT_TRUE(SetupSync()) << "SetupSync() failed.";
   ASSERT_TRUE(search_engines_helper::ServiceMatchesVerifier(0));
-
   search_engines_helper::AddSearchEngine(0, 0);
-
-  ASSERT_TRUE(AwaitCommitActivityCompletion(GetSyncService(0)));
+  ASSERT_TRUE(UpdatedProgressMarkerChecker(GetSyncService(0)).Wait());
   ASSERT_TRUE(search_engines_helper::ServiceMatchesVerifier(0));
 }