Convert //sync from scoped_ptr to std::unique_ptr

sync/test/fake_server/tombstone_entity.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/test/fake_server/tombstone_entity.h"
 
 #include <string>
 
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/protocol/sync.pb.h"
 #include "sync/test/fake_server/fake_server_entity.h"
 
 using std::string;
 
 using syncer::ModelType;
 
 namespace fake_server {
 
 TombstoneEntity::~TombstoneEntity() { }
 
 // static
-scoped_ptr<FakeServerEntity> TombstoneEntity::Create(const string& id) {
+std::unique_ptr<FakeServerEntity> TombstoneEntity::Create(const string& id) {
   const ModelType model_type = GetModelTypeFromId(id);
   CHECK_NE(model_type, syncer::UNSPECIFIED) << "Invalid ID was given: " << id;
-  return scoped_ptr<FakeServerEntity>(new TombstoneEntity(id, model_type));
+  return std::unique_ptr<FakeServerEntity>(new TombstoneEntity(id, model_type));
 }
 
 TombstoneEntity::TombstoneEntity(const string& id,
                                  const ModelType& model_type)
     : FakeServerEntity(id, model_type, 0, string()) {
   sync_pb::EntitySpecifics specifics;
   AddDefaultFieldValue(model_type, &specifics);
   SetSpecifics(specifics);
 }
 
 bool TombstoneEntity::RequiresParentId() const {
   return false;
 }
 
 string TombstoneEntity::GetParentId() const {
   return string();
 }
 
 void TombstoneEntity::SerializeAsProto(sync_pb::SyncEntity* proto) const {
   FakeServerEntity::SerializeBaseProtoFields(proto);
 }
 
 bool TombstoneEntity::IsDeleted() const {
   return true;
 }
 
 }  // namespace fake_server