Use std::unique_ptr for base::DictionaryValue and base::ListValue's internal store.

chrome/browser/chromeos/arc/arc_policy_bridge.cc

 // Copyright 2016 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 "chrome/browser/chromeos/arc/arc_policy_bridge.h"
 
 #include <memory>
 #include <string>
 
 #include "base/json/json_reader.h"
@@ skipping 111 matching lines @@
     if (!chromeos::onc::ParseAndValidateOncForImport(
             onc_blob, onc::ONCSource::ONC_SOURCE_USER_POLICY,
             "" /* no passphrase */, &unused_network_configs,
             &unused_global_network_config, &certificates)) {
       LOG(ERROR) << "Value of onc policy has invalid format =" << onc_blob;
     }
   }
 
   std::unique_ptr<base::ListValue> ca_certs(
       base::WrapUnique(new base::ListValue()));
-  for (const auto entry : certificates) {
+  for (const auto& entry : certificates) {
     const base::DictionaryValue* certificate = nullptr;
     if (!entry->GetAsDictionary(&certificate)) {
       DLOG(FATAL) << "Value of a certificate entry is not a dictionary "
                   << "value.";
       continue;
     }
 
     std::string cert_type;
     certificate->GetStringWithoutPathExpansion(::onc::certificate::kType,
                                                &cert_type);
@@ skipping 162 matching lines @@
       user_manager::UserManager::Get()->GetPrimaryUser();
   Profile* const profile =
       chromeos::ProfileHelper::Get()->GetProfileByUser(primary_user);
   auto profile_policy_connector =
       policy::ProfilePolicyConnectorFactory::GetForBrowserContext(profile);
   policy_service_ = profile_policy_connector->policy_service();
   is_managed_ = profile_policy_connector->IsManaged();
 }
 
 }  // namespace arc