Finalize backend for fetching more NTPSnippets.

components/ntp_snippets/offline_pages/recent_tab_suggestions_provider.cc

Index: components/ntp_snippets/offline_pages/recent_tab_suggestions_provider.cc
diff --git a/components/ntp_snippets/offline_pages/recent_tab_suggestions_provider.cc b/components/ntp_snippets/offline_pages/recent_tab_suggestions_provider.cc
index 403a5609a809adde793e7d70f23e50f5eb2808f3..fcfb60c6e209045e5003f8729090b63d94972615 100644
--- a/components/ntp_snippets/offline_pages/recent_tab_suggestions_provider.cc
+++ b/components/ntp_snippets/offline_pages/recent_tab_suggestions_provider.cc
@@ -101,9 +101,11 @@ void RecentTabSuggestionsProvider::FetchSuggestionImage(
       FROM_HERE, base::Bind(callback, gfx::Image()));
 }
 
-void RecentTabSuggestionsProvider::FetchMore(const Category& category,
-                                             FetchedMoreCallback callback) {
-  // Ignored.
+void RecentTabSuggestionsProvider::Fetch(
+    const Category& category,
+    std::set<std::string> known_suggestion_ids,
+    FetchingCallback callback) {
+  NOTREACHED();
 }
 
 void RecentTabSuggestionsProvider::ClearHistory(