[NTP] Refresh promo when users upgrade from M12 to M13.

chrome/browser/web_resource/promo_resource_service.cc

 // Copyright (c) 2011 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/promo_resource_service.h"
 
 #include "base/string_number_conversions.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time.h"
 #include "base/values.h"
@@ skipping 20 matching lines @@
 // Users are randomly assigned to one of kNTPPromoGroupSize buckets, in order
 // to be able to roll out promos slowly, or display different promos to
 // different groups.
 static const int kNTPPromoGroupSize = 16;
 
 // Maximum number of hours for each time slice (4 weeks).
 static const int kMaxTimeSliceHours = 24 * 7 * 4;
 
 // The version of the service (used to expire the cache when upgrading Chrome
 // to versions with different types of promos).
-static const int kPromoServiceVersion = 1;
+static const int kPromoServiceVersion = 2;
 
 // Properties used by the server.
 static const char kAnswerIdProperty[] = "answer_id";
 static const char kWebStoreHeaderProperty[] = "question";
 static const char kWebStoreButtonProperty[] = "inproduct_target";
 static const char kWebStoreLinkProperty[] = "inproduct";
 static const char kWebStoreExpireProperty[] = "tooltip";
 
 }  // namespace
 
@@ skipping 425 matching lines @@
     base::ThreadRestrictions::ScopedAllowIO allow_io;
     platform_util::Channel channel = platform_util::GetChannel();
     is_promo_build = PromoResourceService::IsBuildTargeted(
         channel, prefs->GetInteger(prefs::kNTPPromoBuild));
   }
 
   return !promo_closed && !is_synced && is_promo_build;
 }
 
 }  // namespace PromoResourceServiceUtil