Convert enable_pre_sync_backup flag to new flags system.

components/sync_driver/backup_rollback_controller.cc

 // Copyright 2014 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 "components/sync_driver/backup_rollback_controller.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/metrics/field_trial.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "components/sync_driver/signin_manager_wrapper.h"
+#include "components/sync_driver/sync_driver_features.h"
 #include "components/sync_driver/sync_driver_switches.h"
 #include "components/sync_driver/sync_prefs.h"
 
 namespace sync_driver {
 
-#if defined(ENABLE_PRE_SYNC_BACKUP)
+#if BUILDFLAG(ENABLE_PRE_SYNC_BACKUP)
 // Number of rollback attempts to try before giving up.
 static const int kRollbackLimits = 3;
 
 // Finch experiment name and group.
 static char kSyncBackupFinchName[] = "SyncBackup";
 static char kSyncBackupFinchDisabled[] = "disabled";
 #endif
 
 BackupRollbackController::BackupRollbackController(
     sync_driver::SyncPrefs* sync_prefs,
@@ skipping 33 matching lines @@
   int rollback_tries = sync_prefs_->GetRemainingRollbackTries();
   if (rollback_tries <= 0)
     return false;  // No pending rollback.
 
   sync_prefs_->SetRemainingRollbackTries(rollback_tries - 1);
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, start_rollback_);
   return true;
 }
 
 void BackupRollbackController::OnRollbackReceived() {
-#if defined(ENABLE_PRE_SYNC_BACKUP)
+#if BUILDFLAG(ENABLE_PRE_SYNC_BACKUP)
   sync_prefs_->SetRemainingRollbackTries(kRollbackLimits);
 #endif
 }
 
 void BackupRollbackController::OnRollbackDone() {
-#if defined(ENABLE_PRE_SYNC_BACKUP)
+#if BUILDFLAG(ENABLE_PRE_SYNC_BACKUP)
   sync_prefs_->SetRemainingRollbackTries(0);
 #endif
 }
 
 // static
 bool BackupRollbackController::IsBackupEnabled() {
-#if defined(ENABLE_PRE_SYNC_BACKUP)
+#if BUILDFLAG(ENABLE_PRE_SYNC_BACKUP)
   const std::string group_name =
       base::FieldTrialList::FindFullName(kSyncBackupFinchName);
 
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kSyncDisableBackup) ||
       group_name == kSyncBackupFinchDisabled) {
     return false;
   }
   return true;
 #else
   return false;
 #endif
 }
 
 }  // namespace sync_driver