[NTP::SectionOrder] Propagate new order through ContentSuggestionsService.

components/ntp_snippets/content_suggestions_service.cc

Index: components/ntp_snippets/content_suggestions_service.cc
diff --git a/components/ntp_snippets/content_suggestions_service.cc b/components/ntp_snippets/content_suggestions_service.cc
index 62bb459dfcfb6ae8757f869409de1b999b586d1c..98055d7778d05e5fd3229102cf877dcb8b696b6e 100644
--- a/components/ntp_snippets/content_suggestions_service.cc
+++ b/components/ntp_snippets/content_suggestions_service.cc
@@ -66,6 +66,11 @@ void ContentSuggestionsService::RegisterProfilePrefs(
   registry->RegisterListPref(prefs::kDismissedCategories);
 }
 
+const std::vector<Category>& ContentSuggestionsService::GetCategories() {
+  SortCategories();
+  return categories_;
+}
+
 CategoryStatus ContentSuggestionsService::GetCategoryStatus(
     Category category) const {
   if (state_ == State::DISABLED) {