Finalize backend for fetching more NTPSnippets.

components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc

Index: components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
diff --git a/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc b/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
index 4f1508801d0dfc01fedb1367219fa625cff616f1..ef2f42b1ba0d2c7bf70257a139c0140254f0ad47 100644
--- a/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
+++ b/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.cc
@@ -153,9 +153,11 @@ void BookmarkSuggestionsProvider::FetchSuggestionImage(
       FROM_HERE, base::Bind(callback, gfx::Image()));
 }
 
-void BookmarkSuggestionsProvider::FetchMore(const Category& category,
-                                            FetchedMoreCallback callback) {
-  // Ignored.
+void BookmarkSuggestionsProvider::Fetch(
+    const Category& category,
+    std::set<std::string> known_suggestion_ids,
+    FetchingCallback callback) {
+  NOTREACHED();
 }
 
 void BookmarkSuggestionsProvider::ClearHistory(