sync: Specialize functions that fetch type root

sync/internal_api/sync_manager_impl.cc

 // 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.
 
 #include "sync/internal_api/sync_manager_impl.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 1017 matching lines @@
 }
 
 const std::string SyncManagerImpl::cache_guid() {
   DCHECK(initialized_);
   return directory()->cache_guid();
 }
 
 bool SyncManagerImpl::ReceivedExperiment(Experiments* experiments) {
   ReadTransaction trans(FROM_HERE, GetUserShare());
   ReadNode nigori_node(&trans);
-  if (nigori_node.InitByTagLookup(kNigoriTag) != BaseNode::INIT_OK) {
+  if (nigori_node.InitTypeRoot(NIGORI) != BaseNode::INIT_OK) {
     DVLOG(1) << "Couldn't find Nigori node.";
     return false;
   }
   bool found_experiment = false;
 
   ReadNode favicon_sync_node(&trans);
   if (favicon_sync_node.InitByClientTagLookup(
           syncer::EXPERIMENTS,
           syncer::kFaviconSyncTag) == BaseNode::INIT_OK) {
     experiments->favicon_sync_limit =
@@ skipping 93 matching lines @@
 int SyncManagerImpl::GetDefaultNudgeDelay() {
   return kDefaultNudgeDelayMilliseconds;
 }
 
 // static.
 int SyncManagerImpl::GetPreferencesNudgeDelay() {
   return kPreferencesNudgeDelayMilliseconds;
 }
 
 }  // namespace syncer