ntp_snippets: default to staging API on dev/canary

chrome/browser/ntp_snippets/content_suggestions_service_factory.cc

Index: chrome/browser/ntp_snippets/content_suggestions_service_factory.cc
diff --git a/chrome/browser/ntp_snippets/content_suggestions_service_factory.cc b/chrome/browser/ntp_snippets/content_suggestions_service_factory.cc
index a9d0d7a25e3d7b0f8b5931f6974c392cb7a564cf..99012936f2ebddb51b445960eb69cd77dc5109e6 100644
--- a/chrome/browser/ntp_snippets/content_suggestions_service_factory.cc
+++ b/chrome/browser/ntp_snippets/content_suggestions_service_factory.cc
@@ -90,6 +90,7 @@ using ntp_snippets::BookmarkSuggestionsProvider;
 using ntp_snippets::CategoryRanker;
 using ntp_snippets::ContentSuggestionsService;
 using ntp_snippets::ForeignSessionsSuggestionsProvider;
+using ntp_snippets::GetFetchEndpoint;
 using ntp_snippets::PersistentScheduler;
 using ntp_snippets::RemoteSuggestionsDatabase;
 using ntp_snippets::RemoteSuggestionsFetcher;
@@ -198,6 +199,7 @@ void RegisterArticleProvider(SigninManagerBase* signin_manager,
   auto suggestions_fetcher = base::MakeUnique<RemoteSuggestionsFetcher>(
       signin_manager, token_service, request_context, pref_service,
       language_model, base::Bind(&safe_json::SafeJsonParser::Parse),
+      GetFetchEndpoint(chrome::GetChannel()),
       is_stable_channel ? google_apis::GetAPIKey()
                         : google_apis::GetNonStableAPIKey(),
       service->user_classifier());