[NTP Snippets] Increase default expiry time to 3 days

components/ntp_snippets/ntp_snippets_service.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 "components/ntp_snippets/ntp_snippets_service.h"
 
 #include <algorithm>
 #include <iterator>
 #include <utility>
 
@@ skipping 50 matching lines @@
 const char kFetchingIntervalWifiParamName[] =
     "fetching_interval_wifi_seconds";
 const char kFetchingIntervalFallbackParamName[] =
     "fetching_interval_fallback_seconds";
 
 // These define the times of day during which we will fetch via Wifi (without
 // charging) - 6 AM to 10 PM.
 const int kWifiFetchingHourMin = 6;
 const int kWifiFetchingHourMax = 22;
 
-const int kDefaultExpiryTimeMins = 24 * 60;
+const int kDefaultExpiryTimeMins = 3 * 24 * 60;
 
 base::TimeDelta GetFetchingInterval(const char* switch_name,
                                     const char* param_name,
                                     int default_value_seconds) {
   int value_seconds = default_value_seconds;
 
   // The default value can be overridden by a variation parameter.
   // TODO(treib,jkrcal): Use GetVariationParamValueByFeature and get rid of
   // kStudyName, also in NTPSnippetsFetcher.
   std::string param_value_str = variations::GetVariationParamValue(
@@ skipping 965 matching lines @@
 }
 
 NTPSnippetsService::CategoryContent::CategoryContent() = default;
 NTPSnippetsService::CategoryContent::CategoryContent(CategoryContent&&) =
     default;
 NTPSnippetsService::CategoryContent::~CategoryContent() = default;
 NTPSnippetsService::CategoryContent& NTPSnippetsService::CategoryContent::
 operator=(CategoryContent&&) = default;
 
 }  // namespace ntp_snippets