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

chrome/browser/policy/managed_bookmarks_policy_handler.cc

Index: chrome/browser/policy/managed_bookmarks_policy_handler.cc
diff --git a/chrome/browser/policy/managed_bookmarks_policy_handler.cc b/chrome/browser/policy/managed_bookmarks_policy_handler.cc
index 3c144247ef721194e33d176c92b8386c472fac6c..58bb19843be8fe748cea5f74cbae60cc3d5ac606 100644
--- a/chrome/browser/policy/managed_bookmarks_policy_handler.cc
+++ b/chrome/browser/policy/managed_bookmarks_policy_handler.cc
@@ -49,7 +49,7 @@ void ManagedBookmarksPolicyHandler::ApplyPolicySettings(
 std::string
 ManagedBookmarksPolicyHandler::GetFolderName(const base::ListValue& list) {
   // Iterate over the list, and try to find the FolderName.
-  for (auto el : list) {
+  for (const auto& el : list) {
     const base::DictionaryValue* dict = NULL;
     if (!el || !el->GetAsDictionary(&dict)) continue;