Snippets are enabled when search suggestions are enabled.

components/ntp_snippets/ntp_snippets_service.h

Index: components/ntp_snippets/ntp_snippets_service.h
diff --git a/components/ntp_snippets/ntp_snippets_service.h b/components/ntp_snippets/ntp_snippets_service.h
index a5bac53c11f3fe8e0bd2034c6e06dcb037ef7eed..cdfd97db0ba5bc94cf413c0d730c7c9af262e32f 100644
--- a/components/ntp_snippets/ntp_snippets_service.h
+++ b/components/ntp_snippets/ntp_snippets_service.h
@@ -64,6 +64,7 @@ class NTPSnippetsService : public KeyedService,
   // the locale, so 'en_US' (English language with US locale) and 'en-GB_US'
   // (British English person in the US) are not language codes.
   NTPSnippetsService(
+      bool enabled,
       PrefService* pref_service,
       sync_driver::SyncService* sync_service,
       suggestions::SuggestionsService* suggestions_service,
@@ -76,8 +77,6 @@ class NTPSnippetsService : public KeyedService,
 
   static void RegisterProfilePrefs(PrefRegistrySimple* registry);
 
-  void Init(bool enabled);
-
   // Inherited from KeyedService.
   void Shutdown() override;
 
@@ -163,11 +162,13 @@ class NTPSnippetsService : public KeyedService,
   bool IsSyncStateIncompatible();
 
   enum class State {
-    NOT_INITED,
     INITED,
     SHUT_DOWN
   } state_;
 
+  // When |enabled_| is true the service will fetch snippets from the server
+  // using |snippets_fetcher_|, load snippets from device storage, and schedule
+  // the |scheduler_|.
   bool enabled_;
 
   PrefService* pref_service_;