Merge pull request #537 from markdroth/create-pull-request/patch-8f581c8

Automated fix for refs/heads/cds_metadata

src/core/xds/grpc/xds_cluster_parser.cc

@@ -683,7 +683,7 @@ absl::StatusOr<std::shared_ptr<const XdsClusterResource>> CdsResourceParse(
             &errors, absl::StrCat(".metadata.filter_metadata[", key, "]"));
         errors.AddError(json.status().message());
       } else if (!cds_update->metadata.contains(key)) {
-        cds_update->metadata[std::move(key)] = std::move(*json);
+        cds_update->metadata[key] = std::move(*json);
       }
     }
   }