[Sync] Eliminate friends from Directory by exposing kernel via accessor

sync/internal_api/sync_rollback_manager_base.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_rollback_manager_base.h"
 
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/read_node.h"
 #include "sync/internal_api/public/read_transaction.h"
 #include "sync/internal_api/public/write_transaction.h"
@@ skipping 119 matching lines @@
 
 SyncStatus SyncRollbackManagerBase::GetDetailedStatus() const {
   return SyncStatus();
 }
 
 void SyncRollbackManagerBase::SaveChanges() {
 }
 
 void SyncRollbackManagerBase::ShutdownOnSyncThread(ShutdownReason reason) {
   if (initialized_) {
-    share_.directory->Close();
     share_.directory.reset();
     initialized_ = false;
   }
 }
 
 UserShare* SyncRollbackManagerBase::GetUserShare() {
   return &share_;
 }
 
 const std::string SyncRollbackManagerBase::cache_guid() {
@@ skipping 168 matching lines @@
 
 void SyncRollbackManagerBase::UnregisterDirectoryTypeDebugInfoObserver(
     syncer::TypeDebugInfoObserver* observer) {}
 
 bool SyncRollbackManagerBase::HasDirectoryTypeDebugInfoObserver(
     syncer::TypeDebugInfoObserver* observer) { return false; }
 
 void SyncRollbackManagerBase::RequestEmitDebugInfo() {}
 
 }  // namespace syncer