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

chrome/browser/extensions/api/gcd_private/gcd_private_api.cc

Index: chrome/browser/extensions/api/gcd_private/gcd_private_api.cc
diff --git a/chrome/browser/extensions/api/gcd_private/gcd_private_api.cc b/chrome/browser/extensions/api/gcd_private/gcd_private_api.cc
index 2d3a5df9d54d9cd445ca4055463db2ba8f4b7bea..9541d0efa5c7a929297dc2b82d40a8cfadddddc6 100644
--- a/chrome/browser/extensions/api/gcd_private/gcd_private_api.cc
+++ b/chrome/browser/extensions/api/gcd_private/gcd_private_api.cc
@@ -312,7 +312,7 @@ void GcdPrivateCreateSessionFunction::OnSessionInitialized(
   if (status == gcd_private::STATUS_SUCCESS) {
     const base::ListValue* pairing = nullptr;
     if (info.GetList("authentication.pairing", &pairing)) {
-      for (const base::Value* value : *pairing) {
+      for (const auto& value : *pairing) {
         std::string pairing_string;
         if (value->GetAsString(&pairing_string)) {
           api::gcd_private::PairingType pairing_type =