[NTP Snippets] Fetcher: remove |overwrite| param

components/ntp_snippets/ntp_snippets_service.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_NTP_SNIPPETS_NTP_SNIPPETS_SERVICE_H_
 #define COMPONENTS_NTP_SNIPPETS_NTP_SNIPPETS_SERVICE_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 40 matching lines @@
                      scoped_refptr<base::SequencedTaskRunner> file_task_runner,
                      const std::string& application_language_code,
                      NTPSnippetsScheduler* scheduler,
                      scoped_ptr<NTPSnippetsFetcher> snippets_fetcher);
   ~NTPSnippetsService() override;
 
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
   void Init(bool enabled);
 
-  // Fetches snippets from the server. |overwrite| is true if existing snippets
-  // should be overwritten.
-  void FetchSnippets(bool overwrite);
+  // Fetches snippets from the server.
+  void FetchSnippets();
 
   // Inherited from KeyedService.
   void Shutdown() override;
 
   // True once the data is loaded in memory and available to loop over.
   bool is_loaded() { return loaded_; }
 
   // Observer accessors.
   void AddObserver(NTPSnippetsServiceObserver* observer);
   void RemoveObserver(NTPSnippetsServiceObserver* observer);
@@ skipping 87 matching lines @@
   // Send when the service is shutting down.
   virtual void NTPSnippetsServiceShutdown(NTPSnippetsService* service) = 0;
 
  protected:
   virtual ~NTPSnippetsServiceObserver() {}
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_NTP_SNIPPETS_SERVICE_H_