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

chrome/browser/interests/interests_fetcher.cc

Index: chrome/browser/interests/interests_fetcher.cc
diff --git a/chrome/browser/interests/interests_fetcher.cc b/chrome/browser/interests/interests_fetcher.cc
index 49ba04da0682daa3d12d61e2232c6dc750192d95..0b755d11b07842fb46ba8e567b25556e81ddd509 100644
--- a/chrome/browser/interests/interests_fetcher.cc
+++ b/chrome/browser/interests/interests_fetcher.cc
@@ -182,7 +182,7 @@ InterestsFetcher::ExtractInterests(const std::string& response) {
   }
 
   std::unique_ptr<std::vector<Interest>> res(new std::vector<Interest>());
-  for (const base::Value* entry : *interests_list) {
+  for (const auto& entry : *interests_list) {
     const base::DictionaryValue* interest_dict = nullptr;
     if (!entry->GetAsDictionary(&interest_dict)) {
       DLOG(WARNING) << "Failed to parse interest dictionary.";