Remove SyncManager::Init() return value

sync/internal_api/public/sync_manager.h

 // Copyright (c) 2012 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 SYNC_INTERNAL_API_PUBLIC_SYNC_MANAGER_H_
 #define SYNC_INTERNAL_API_PUBLIC_SYNC_MANAGER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 345 matching lines @@
   // HTTP header. Used internally when collecting stats to classify clients.
   // |sync_notifier| is owned and used to listen for notifications.
   // |restored_key_for_bootstrapping| is the key used to boostrap the
   // cryptographer
   // |keystore_encryption_enabled| determines whether we enable the keystore
   // encryption functionality in the cryptographer/nigori.
   // |report_unrecoverable_error_function| may be NULL.
   //
   // TODO(akalin): Replace the |post_factory| parameter with a
   // URLFetcher parameter.
-  virtual bool Init(
+  virtual void Init(
       const FilePath& database_location,
       const WeakHandle<JsEventHandler>& event_handler,
       const std::string& sync_server_and_path,
       int sync_server_port,
       bool use_ssl,
       const scoped_refptr<base::TaskRunner>& blocking_task_runner,
       scoped_ptr<HttpPostProviderFactory> post_factory,
       const std::vector<ModelSafeWorker*>& workers,
       ExtensionsActivityMonitor* extensions_activity_monitor,
       ChangeDelegate* change_delegate,
@@ skipping 145 matching lines @@
   virtual bool ReceivedExperiment(Experiments* experiments) = 0;
 
   // Uses a read-only transaction to determine if the directory being synced has
   // any remaining unsynced items.  May be called on any thread.
   virtual bool HasUnsyncedItems() = 0;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_SYNC_MANAGER_H_