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

chrome/browser/sync/test/integration/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 "chrome/browser/sync/test/integration/sync_test.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <limits>
@@ skipping 998 matching lines @@
 
   return AwaitEncryptionComplete(index);
 }
 
 bool SyncTest::IsEncryptionComplete(int index) {
   return ::IsEncryptionComplete(GetClient(index)->service());
 }
 
 bool SyncTest::AwaitEncryptionComplete(int index) {
   ProfileSyncService* service = GetClient(index)->service();
-  EncryptionChecker checker(service);
-  checker.Wait();
-  return !checker.TimedOut();
+  return EncryptionChecker(service).Wait();
 }
 
 bool SyncTest::AwaitQuiescence() {
   return ProfileSyncServiceHarness::AwaitQuiescence(clients());
 }
 
 bool SyncTest::UsingExternalServers() {
   return server_type_ == EXTERNAL_LIVE_SERVER;
 }
 
@@ skipping 100 matching lines @@
 
 void SyncTest::TriggerSyncForModelTypes(int index,
                                         syncer::ModelTypeSet model_types) {
   GetSyncService(index)->TriggerRefresh(model_types);
 }
 
 void SyncTest::SetPreexistingPreferencesFileContents(
     const std::string& contents) {
   preexisting_preferences_file_contents_ = contents;
 }