Fix regression due to deprecated promo preference.

chrome/browser/web_resource/notification_promo.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/web_resource/notification_promo.h"
 
 #include <cmath>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 337 matching lines @@
   const double old_end = old_promo.end_;
   const std::string old_promo_text = old_promo.promo_text_;
 
   new_notification_ =
       old_start != start_ || old_end != end_ || old_promo_text != promo_text_;
   if (new_notification_)
     OnNewNotification();
 }
 
 void NotificationPromo::OnNewNotification() {
+  DVLOG(1) << "OnNewNotification";
   // Create a new promo group.
   group_ = base::RandInt(0, num_groups_ - 1);
   WritePrefs();
 }
 
 // static
 void NotificationPromo::RegisterUserPrefs(PrefService* prefs) {
   ClearDeprecatedPrefs(prefs);
   prefs->RegisterDictionaryPref("promo",
                                 new base::DictionaryValue,
@@ skipping 136 matching lines @@
   if (group_ < initial_segment_)
     return start_;
   return start_ +
       std::ceil(static_cast<float>(group_ - initial_segment_ + 1) / increment_)
       * time_slice_;
 }
 
 double NotificationPromo::EndTime() const {
   return end_;
 }