Remove raw base::DictionaryValue::Set in //extensions

extensions/utility/unpacker.cc

Index: extensions/utility/unpacker.cc
diff --git a/extensions/utility/unpacker.cc b/extensions/utility/unpacker.cc
index e946013292b07c6e10006a583600724add13beab..81b8d5a2af349b8c2927e1a50b6b02607fc5bbfd 100644
--- a/extensions/utility/unpacker.cc
+++ b/extensions/utility/unpacker.cc
@@ -318,7 +318,7 @@ bool Unpacker::ReadMessageCatalog(const base::FilePath& message_path) {
     NOTREACHED();
     return false;
   }
-  parsed_catalogs_->Set(dir_name, root.release());
+  parsed_catalogs_->Set(dir_name, std::move(root));
 
   return true;
 }