Finalize backend for fetching more NTPSnippets.

components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc

Index: components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc
diff --git a/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc b/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc
index b00c2c40ec6a97ec934b12fac8e58545da766b65..84134f894e87932053cad1dfe9cba50826b9a230 100644
--- a/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc
+++ b/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc
@@ -91,10 +91,11 @@ void PhysicalWebPageSuggestionsProvider::FetchSuggestionImage(
       FROM_HERE, base::Bind(callback, gfx::Image()));
 }
 
-void PhysicalWebPageSuggestionsProvider::FetchMore(
+void PhysicalWebPageSuggestionsProvider::Fetch(
     const Category& category,
-    FetchedMoreCallback callback) {
-  // Ignored.
+    std::set<std::string> known_suggestion_ids,
+    FetchingCallback callback) {
+  NOTREACHED();
 }
 
 void PhysicalWebPageSuggestionsProvider::ClearHistory(