[NTP Snippets] Persist the set of snippets in a pref

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 1b37e180b490b5d860bac2c399ce8429379d2112..74cc3664c200ed4716e58da85c18fd02c47cc746 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -73,6 +73,7 @@
 #include "components/flags_ui/pref_service_flags_storage.h"
 #include "components/gcm_driver/gcm_channel_status_syncer.h"
 #include "components/network_time/network_time_tracker.h"
+#include "components/ntp_snippets/ntp_snippets_service.h"
 #include "components/omnibox/browser/zero_suggest_provider.h"
 #include "components/password_manager/core/browser/password_bubble_experiment.h"
 #include "components/password_manager/core/browser/password_manager.h"
@@ -424,6 +425,7 @@ void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
   MediaDeviceIDSalt::RegisterProfilePrefs(registry);
   MediaStreamDevicesController::RegisterProfilePrefs(registry);
   NetPrefObserver::RegisterProfilePrefs(registry);
+  ntp_snippets::NTPSnippetsService::RegisterProfilePrefs(registry);
   password_bubble_experiment::RegisterPrefs(registry);
   password_manager::PasswordManager::RegisterProfilePrefs(registry);
   PrefProxyConfigTrackerImpl::RegisterProfilePrefs(registry);