[NTP::PhysicalWeb] Implement suggestion dismissal.

components/ntp_snippets/content_suggestions_provider.h

Index: components/ntp_snippets/content_suggestions_provider.h
diff --git a/components/ntp_snippets/content_suggestions_provider.h b/components/ntp_snippets/content_suggestions_provider.h
index 54b2defd2bb7f8635f520b68058e5d6e3143b93a..8d941943475b434a3da0a0d90691e2cd097b4d4a 100644
--- a/components/ntp_snippets/content_suggestions_provider.h
+++ b/components/ntp_snippets/content_suggestions_provider.h
@@ -82,7 +82,7 @@ class ContentSuggestionsProvider {
 
   // Dismisses the suggestion with the given ID. A provider needs to ensure that
   // a once-dismissed suggestion is never delivered again (through the
-  // Observer). The provider must not call Observer::OnSuggestionsChanged if the
+  // Observer). The provider must not call Observer::OnNewSuggestions if the
   // removal of the dismissed suggestion is the only change.
   virtual void DismissSuggestion(
       const ContentSuggestion::ID& suggestion_id) = 0;