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

chrome/browser/chromeos/arc/arc_policy_bridge.cc

Index: chrome/browser/chromeos/arc/arc_policy_bridge.cc
diff --git a/chrome/browser/chromeos/arc/arc_policy_bridge.cc b/chrome/browser/chromeos/arc/arc_policy_bridge.cc
index 67f9e6837d0fedb8fcda2f46ea8ef70dc186f91d..3cbc920e09cb0042bcc5b64124f21e56eec6d9f5 100644
--- a/chrome/browser/chromeos/arc/arc_policy_bridge.cc
+++ b/chrome/browser/chromeos/arc/arc_policy_bridge.cc
@@ -129,7 +129,7 @@ void AddOncCaCertsToPolicies(const policy::PolicyMap& policy_map,
 
   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 "