Enable rollback by default on trunk (m38).

chrome/browser/sync/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 "chrome/browser/sync/backup_rollback_controller.h"
 
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/field_trial.h"
 #include "chrome/browser/sync/supervised_user_signin_manager_wrapper.h"
@@ skipping 23 matching lines @@
       weak_ptr_factory_(this) {
 }
 
 BackupRollbackController::~BackupRollbackController() {
 }
 
 void BackupRollbackController::Start(base::TimeDelta delay) {
   if (!IsBackupEnabled())
     return;
 
-  if (!CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kSyncEnableRollback)) {
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kSyncDisableRollback)) {
     sync_prefs_->SetRemainingRollbackTries(0);
   }
 
   if (delay == base::TimeDelta()) {
     TryStart();
   } else {
     base::MessageLoop::current()->PostDelayedTask(
         FROM_HERE,
         base::Bind(&BackupRollbackController::TryStart,
                    weak_ptr_factory_.GetWeakPtr()),
@@ skipping 41 matching lines @@
       group_name == kSyncBackupFinchDisabled)  {
     return false;
   }
   return true;
 #else
   return false;
 #endif
 }
 
 }  // namespace browser_sync