sync: Implement disabling of non blocking types

sync/internal_api/sync_core.cc

 // Copyright 2014 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.
 
 #include "sync/internal_api/sync_core.h"
 
 #include "sync/engine/non_blocking_type_processor_core.h"
 #include "sync/sessions/model_type_registry.h"
 
 namespace syncer {
 
 SyncCore::SyncCore(ModelTypeRegistry* model_type_registry)
     : model_type_registry_(model_type_registry), weak_ptr_factory_(this) {}
 
 SyncCore::~SyncCore() {}
 
 void SyncCore::ConnectSyncTypeToCore(
     ModelType type,
     scoped_refptr<base::SequencedTaskRunner> task_runner,
     base::WeakPtr<NonBlockingTypeProcessor> processor) {
 
   // Initialize the processor's sync-thread sibling and the
   // processor <-> processor_core (ie. model thread <-> sync thread)
   // communication channel.
   model_type_registry_->InitializeNonBlockingType(type, task_runner, processor);
 }
 
+void SyncCore::Disconnect(ModelType type) {
+  model_type_registry_->RemoveNonBlockingType(type);
+}
+
 base::WeakPtr<SyncCore> SyncCore::AsWeakPtr() {
   return weak_ptr_factory_.GetWeakPtr();
 }
 
 }  // namespace syncer