[Session restore] Rename group name Enabled to Restore.

chrome/browser/sessions/session_restore_delegate.cc

 // Copyright 2015 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/sessions/session_restore_delegate.h"
 
 #include "base/metrics/field_trial.h"
 #include "chrome/browser/sessions/session_restore_stats_collector.h"
 #include "chrome/browser/sessions/tab_loader.h"
 
 // static
 void SessionRestoreDelegate::RestoreTabs(
     const std::vector<RestoredTab>& tabs,
     const base::TimeTicks& restore_started) {
   // TODO(georgesak): make tests aware of that behavior so that they succeed if
   // tab loading is disabled.
   base::FieldTrial* trial =
       base::FieldTrialList::Find("SessionRestoreBackgroundLoading");
   bool active_only = true;
-  if (!trial || trial->group_name() == "Enabled") {
+  if (!trial || trial->group_name() == "Restore") {
     TabLoader::RestoreTabs(tabs, restore_started);
     active_only = false;
   }
   SessionRestoreStatsCollector::TrackTabs(tabs, restore_started, active_only);
 }