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

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

 // Copyright 2013 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/profile_sync_service_harness.h"
 
 #include <cstddef>
 #include <iterator>
 #include <ostream>
 #include <sstream>
@@ skipping 210 matching lines @@
 
 bool ProfileSyncServiceHarness::AwaitMutualSyncCycleCompletion(
     ProfileSyncServiceHarness* partner) {
   std::vector<ProfileSyncServiceHarness*> harnesses;
   harnesses.push_back(this);
   harnesses.push_back(partner);
   return AwaitQuiescence(harnesses);
 }
 
 bool ProfileSyncServiceHarness::AwaitGroupSyncCycleCompletion(
-    std::vector<ProfileSyncServiceHarness*>& partners) {
+    const std::vector<ProfileSyncServiceHarness*>& partners) {
   return AwaitQuiescence(partners);
 }
 
 // static
 bool ProfileSyncServiceHarness::AwaitQuiescence(
-    std::vector<ProfileSyncServiceHarness*>& clients) {
+    const std::vector<ProfileSyncServiceHarness*>& clients) {
   std::vector<ProfileSyncService*> services;
   if (clients.empty()) {
     return true;
   }
 
-  for (std::vector<ProfileSyncServiceHarness*>::iterator it = clients.begin();
-       it != clients.end(); ++it) {
-    services.push_back((*it)->service());
+  for (const ProfileSyncServiceHarness* harness : clients) {
+    services.push_back(harness->service());
   }
-  QuiesceStatusChangeChecker checker(services);
-  checker.Wait();
-  return !checker.TimedOut();
+  return QuiesceStatusChangeChecker(services).Wait();
 }
 
 bool ProfileSyncServiceHarness::AwaitBackendInitialization() {
-  BackendInitializeChecker checker(service());
-  checker.Wait();
-
-  if (checker.TimedOut()) {
+  if (!BackendInitializeChecker(service()).Wait()) {
     LOG(ERROR) << "BackendInitializeChecker timed out.";
     return false;
   }
 
   if (!service()->IsBackendInitialized()) {
     LOG(ERROR) << "Service backend not initialized.";
     return false;
   }
 
   // Make sure that initial sync wasn't blocked by a missing passphrase.
   if (service()->passphrase_required_reason() == syncer::REASON_DECRYPTION) {
     LOG(ERROR) << "A passphrase is required for decryption. Sync cannot proceed"
                   " until SetDecryptionPassphrase is called.";
     return false;
   }
 
   if (HasAuthError(service())) {
     LOG(ERROR) << "Credentials were rejected. Sync cannot proceed.";
     return false;
   }
 
   return true;
 }
 
 bool ProfileSyncServiceHarness::AwaitSyncSetupCompletion() {
-  SyncSetupChecker checker(service());
-  checker.Wait();
-
-  if (checker.TimedOut()) {
+  if (!SyncSetupChecker(service()).Wait()) {
     LOG(ERROR) << "SyncSetupChecker timed out.";
     return false;
   }
 
   // Make sure that initial sync wasn't blocked by a missing passphrase.
   if (service()->passphrase_required_reason() == syncer::REASON_DECRYPTION) {
     LOG(ERROR) << "A passphrase is required for decryption. Sync cannot proceed"
                   " until SetDecryptionPassphrase is called.";
     return false;
   }
@@ skipping 177 matching lines @@
 
 std::string ProfileSyncServiceHarness::GetServiceStatus() {
   std::unique_ptr<base::DictionaryValue> value(
       sync_driver::sync_ui_util::ConstructAboutInformation(
           service(), service()->signin(), chrome::GetChannel()));
   std::string service_status;
   base::JSONWriter::WriteWithOptions(
       *value, base::JSONWriter::OPTIONS_PRETTY_PRINT, &service_status);
   return service_status;
 }