old_contents: /**
   * @license
   * Copyright 2017 Google LLC
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  /**
   * @fileoverview Polyfills to bring the server's partial JavaScript
   * implementation to include some features of ECMAScript 2017 (ES8).
   * @author cpcallen@google.com (Christopher Allen)
   */
  
  ///////////////////////////////////////////////////////////////////////////////
  // Object constructor polyfills
  ///////////////////////////////////////////////////////////////////////////////
  
  Object.getOwnPropertyDescriptors = function getOwnPropertyDescriptors(obj) {
    var ownKeys = Object.getOwnPropertyNames(obj);
    var descriptors = {};
    for (var i = 0; i < ownKeys.length; i++) {
      var key = ownKeys[i];
      var descriptor = Object.getOwnPropertyDescriptor(obj, key);
      if (descriptor !== undefined) {
        descriptors[key] = descriptor;
      }
    }
    return descriptors;
  };
  Object.defineProperty(Object, 'getOwnPropertyDescriptors', {enumerable: false});
  
new_contents: /**
   * @license
   * Copyright 2021 Google LLC
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  /**
   * @fileoverview Polyfills to bring the server's partial JavaScript
   * implementation to include some features of ECMAScript 2017 (ES8).
   * @author cpcallen@google.com (Christopher Allen)
   */
  
  ///////////////////////////////////////////////////////////////////////////////
  // Object constructor polyfills
  ///////////////////////////////////////////////////////////////////////////////
  
  Object.getOwnPropertyDescriptors = function getOwnPropertyDescriptors(obj) {
    var ownKeys = Object.getOwnPropertyNames(obj);
    var descriptors = {};
    for (var i = 0; i < ownKeys.length; i++) {
      var key = ownKeys[i];
      var descriptor = Object.getOwnPropertyDescriptor(obj, key);
      if (descriptor !== undefined) {
        descriptors[key] = descriptor;
      }
    }
    return descriptors;
  };
  Object.defineProperty(Object, 'getOwnPropertyDescriptors', {enumerable: false});
  
subject: Fix copyright date for PR #470.