Convert //sync from scoped_ptr to std::unique_ptr

sync/internal_api/public/sessions/update_counters.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/public/sessions/update_counters.h"
 
 #include "base/json/json_string_value_serializer.h"
 #include "base/values.h"
 
 namespace syncer {
 
 UpdateCounters::UpdateCounters()
   : num_updates_received(0),
     num_reflected_updates_received(0),
     num_tombstone_updates_received(0),
     num_updates_applied(0),
     num_hierarchy_conflict_application_failures(0),
     num_encryption_conflict_application_failures(0),
     num_server_overwrites(0),
     num_local_overwrites(0) {}
 
 UpdateCounters::~UpdateCounters() {}
 
-scoped_ptr<base::DictionaryValue> UpdateCounters::ToValue() const {
-  scoped_ptr<base::DictionaryValue> value(new base::DictionaryValue());
+std::unique_ptr<base::DictionaryValue> UpdateCounters::ToValue() const {
+  std::unique_ptr<base::DictionaryValue> value(new base::DictionaryValue());
 
   value->SetInteger("numUpdatesReceived", num_updates_received);
   value->SetInteger("numReflectedUpdatesReceived",
                     num_reflected_updates_received);
   value->SetInteger("numTombstoneUpdatesReceived",
                     num_tombstone_updates_received);
 
   value->SetInteger("numUpdatesApplied", num_updates_applied);
   value->SetInteger("numHierarchyConflictApplicationFailures",
                     num_hierarchy_conflict_application_failures);
   value->SetInteger("numEncryptionConflictApplicationFailures",
                     num_encryption_conflict_application_failures);
 
   value->SetInteger("numServerOverwrites", num_server_overwrites);
   value->SetInteger("numLocalOverwrites", num_local_overwrites);
 
   return value;
 }
 
 std::string UpdateCounters::ToString() const {
   std::string result;
-  scoped_ptr<base::DictionaryValue> value = ToValue();
+  std::unique_ptr<base::DictionaryValue> value = ToValue();
   JSONStringValueSerializer serializer(&result);
   serializer.Serialize(*value);
   return result;
 }
 
 }  // namespace syncer