[NTP Snippets] Introduce ContentSuggestion::ID

components/ntp_snippets/content_suggestions_provider.cc

Index: components/ntp_snippets/content_suggestions_provider.cc
diff --git a/components/ntp_snippets/content_suggestions_provider.cc b/components/ntp_snippets/content_suggestions_provider.cc
index de3c7592d07c91ed1e50670bd081f2c13acba8df..34896577b984691a8bce6b4a0adc58dade8d582f 100644
--- a/components/ntp_snippets/content_suggestions_provider.cc
+++ b/components/ntp_snippets/content_suggestions_provider.cc
@@ -15,20 +15,4 @@ ContentSuggestionsProvider::ContentSuggestionsProvider(
 
 ContentSuggestionsProvider::~ContentSuggestionsProvider() = default;
 
-std::string ContentSuggestionsProvider::MakeUniqueID(
-    Category category,
-    const std::string& within_category_id) const {
-  return category_factory()->MakeUniqueID(category, within_category_id);
-}
-
-Category ContentSuggestionsProvider::GetCategoryFromUniqueID(
-    const std::string& unique_id) const {
-  return category_factory()->GetCategoryFromUniqueID(unique_id);
-}
-
-std::string ContentSuggestionsProvider::GetWithinCategoryIDFromUniqueID(
-    const std::string& unique_id) const {
-  return category_factory()->GetWithinCategoryIDFromUniqueID(unique_id);
-}
-
 }  // namespace ntp_snippets