[NTP Snippets] Fetcher: remove |overwrite| param

components/ntp_snippets/ntp_snippets_fetcher.h

 // Copyright 2016 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_FETCHER_H_
 #define COMPONENTS_NTP_SNIPPETS_NTP_SNIPPETS_FETCHER_H_
 
+#include <string>
+
 #include "base/callback.h"
 #include "base/callback_list.h"
 #include "base/files/file_path.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/sequenced_task_runner.h"
 #include "google_apis/gaia/oauth2_token_service.h"
 #include "net/url_request/url_request_context_getter.h"
 
 namespace net {
@@ skipping 15 matching lines @@
       base::CallbackList<void(const base::FilePath&)>;
 
   NTPSnippetsFetcher(scoped_refptr<base::SequencedTaskRunner> file_task_runner,
                      SigninManagerBase* signin_manager,
                      OAuth2TokenService* oauth2_token_service,
                      scoped_refptr<net::URLRequestContextGetter>
                         url_request_context_getter,
                      const base::FilePath& base_download_path);
   ~NTPSnippetsFetcher() override;
 
-  // Fetches snippets from the server. |overwrite| is true if existing snippets
-  // should be overwritten.
-  void FetchSnippets(bool overwrite);
-
-  // Adds a callback that is called when a new set of snippets are downloaded
+  // Adds a callback that is called when a new set of snippets are downloaded.
   scoped_ptr<SnippetsAvailableCallbackList::Subscription> AddCallback(
       const SnippetsAvailableCallback& callback) WARN_UNUSED_RESULT;
 
+  // Fetches snippets from the server.
+  void FetchSnippets();
+
  private:
   void StartTokenRequest();
+  void OnFileMoveDone(bool success);
   void NotifyObservers();
-  void OnDownloadSnippetsDone(bool success);
-  void OnFileExistsCheckDone(bool exists);
-  void OnFileMoveDone(bool success);
-  void StartFetch();
 
   // OAuth2TokenService::Consumer overrides:
   void OnGetTokenSuccess(const OAuth2TokenService::Request* request,
                          const std::string& access_token,
                          const base::Time& expiration_time) override;
   void OnGetTokenFailure(const OAuth2TokenService::Request* request,
                          const GoogleServiceAuthError& error) override;
 
   // OAuth2TokenService::Observer overrides:
   void OnRefreshTokenAvailable(const std::string& account_id) override;
@@ skipping 17 matching lines @@
 
   SnippetsAvailableCallbackList callback_list_;
 
   base::WeakPtrFactory<NTPSnippetsFetcher> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NTPSnippetsFetcher);
 };
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_NTP_SNIPPETS_FETCHER_H_