[Offline Pages] Two-step expiration in storage manager.

components/offline_pages/client_policy_controller.cc

 // Copyright 2016 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/offline_pages/client_policy_controller.h"
 
 #include <utility>
 
 #include "base/time/time.h"
 
@@ skipping 22 matching lines @@
                                     base::TimeDelta::FromDays(1), 10)));
 }
 
 ClientPolicyController::~ClientPolicyController() {}
 
 // static
 const OfflinePageClientPolicy ClientPolicyController::MakePolicy(
     const std::string& name_space,
     LifetimeType lifetime_type,
     const base::TimeDelta& expire_period,
-    int page_limit) {
+    size_t page_limit) {
   OfflinePageClientPolicy policy(
       {name_space, {lifetime_type, expire_period, page_limit}});
   return policy;
 }
 
 const OfflinePageClientPolicy& ClientPolicyController::GetPolicy(
     const std::string& name_space) const {
   const auto& iter = policies_.find(name_space);
   if (iter != policies_.end())
     return iter->second;
   // Fallback when the namespace isn't defined.
   return policies_.at(kDefaultNamespace);
 }
 
 }  // namespace offline_pages