[Background fetching] Background fetching when opening an NTP.

ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.cc

Index: ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.cc
diff --git a/ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.cc b/ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.cc
index 66c9ccb4bb1595df21b14fe804e5f4efe6800e38..338e71d43a3fd063c14901b58b5ad6d477657375 100644
--- a/ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.cc
+++ b/ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.cc
@@ -181,8 +181,8 @@ IOSChromeContentSuggestionsServiceFactory::BuildServiceInstanceFor(
     auto scheduling_provider =
         base::MakeUnique<SchedulingRemoteSuggestionsProvider>(
             service.get(), std::move(provider),
-            /*persistent_scheduler=*/nullptr, service->user_classifier(),
-            prefs);
+            /*persistent_scheduler=*/nullptr, service->user_classifier(), prefs,
+            base::MakeUnique<base::DefaultClock>());
     service->set_remote_suggestions_provider(scheduling_provider.get());
     service->set_remote_suggestions_scheduler(scheduling_provider.get());
     service->RegisterProvider(std::move(scheduling_provider));