[Sync] Separate purge types step from sync manager configuration.

components/sync/driver/glue/sync_backend_host_impl.h

 // Copyright 2013 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_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_
 #define COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 121 matching lines @@
   // subclasses can use them.
 
   // Allows tests to perform alternate core initialization work.
   virtual void InitCore(std::unique_ptr<DoInitializeOptions> options);
 
   // Request the syncer to reconfigure with the specfied params.
   // Virtual for testing.
   virtual void RequestConfigureSyncer(
       ConfigureReason reason,
       ModelTypeSet to_download,
-      ModelTypeSet to_purge,
-      ModelTypeSet to_journal,
-      ModelTypeSet to_unapply,
-      ModelTypeSet to_ignore,
       const ModelSafeRoutingInfo& routing_info,
       const base::Callback<void(ModelTypeSet, ModelTypeSet)>& ready_task,
       const base::Closure& retry_callback);
 
   // Called when the syncer has finished performing a configuration.
   void FinishConfigureDataTypesOnFrontendLoop(
       const ModelTypeSet enabled_types,
       const ModelTypeSet succeeded_configuration_types,
       const ModelTypeSet failed_configuration_types,
       const base::Callback<void(ModelTypeSet, ModelTypeSet)>& ready_task);
@@ skipping 184 matching lines @@
   base::ThreadChecker thread_checker_;
 
   base::WeakPtrFactory<SyncBackendHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncBackendHostImpl);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_