[Sync] Replacing NULL with nullptr in code and null in comments for components/sync/

components/sync/syncable/read_node.cc

 // Copyright 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 "components/sync/syncable/read_node.h"
 
 #include "base/logging.h"
 #include "components/sync/syncable/base_transaction.h"
 #include "components/sync/syncable/entry.h"
 #include "components/sync/syncable/syncable_base_transaction.h"
 #include "components/sync/syncable/syncable_util.h"
 
 namespace syncer {
 
 //////////////////////////////////////////////////////////////////////////
 // ReadNode member definitions
 ReadNode::ReadNode(const BaseTransaction* transaction)
-    : entry_(NULL), transaction_(transaction) {
+    : entry_(nullptr), transaction_(transaction) {
   DCHECK(transaction);
 }
 
 ReadNode::ReadNode() {
-  entry_ = NULL;
-  transaction_ = NULL;
+  entry_ = nullptr;
+  transaction_ = nullptr;
 }
 
 ReadNode::~ReadNode() {
   delete entry_;
 }
 
 void ReadNode::InitByRootLookup() {
   DCHECK(!entry_) << "Init called twice";
   syncable::BaseTransaction* trans = transaction_->GetWrappedTrans();
   entry_ = new syncable::Entry(trans, syncable::GET_BY_ID, trans->root_id());
@@ skipping 74 matching lines @@
   if (entry_->GetIsDel())
     return INIT_FAILED_ENTRY_IS_DEL;
   ModelType found_model_type = GetModelType();
   LOG_IF(WARNING, found_model_type == UNSPECIFIED ||
                       found_model_type == TOP_LEVEL_FOLDER)
       << "SyncAPI InitTypeRoot referencing unusually typed object.";
   return DecryptIfNecessary() ? INIT_OK : INIT_FAILED_DECRYPT_IF_NECESSARY;
 }
 
 }  // namespace syncer