update elements and fix some bugs

lib/google_maps_api.dart

 // DO NOT EDIT: auto-generated with `pub run custom_element_apigen:update`
 
 /// Dart API for the polymer element `google_maps_api`.
 @HtmlImport('google_maps_api_nodart.html')
 library polymer_elements.lib.src.google_apis.google_maps_api;
 
 import 'dart:html';
 import 'dart:js' show JsArray, JsObject;
 import 'package:web_components/web_components.dart';
 import 'package:polymer_interop/polymer_interop.dart';
@@ skipping 30 matching lines @@
   set clientId(String value) { jsElement[r'clientId'] = value; }
 
   /// The localized language to load the Maps API with. For more information
   /// see https://developers.google.com/maps/documentation/javascript/basics#Language
   ///
   /// Note: the Maps API defaults to the preffered language setting of the browser.
   /// Use this parameter to override that behavior.
   String get language => jsElement[r'language'];
   set language(String value) { jsElement[r'language'] = value; }
 
-  /// The libraries to load with this map. For more information
-  /// see https://developers.google.com/maps/documentation/javascript/libraries.
-  String get libraries => jsElement[r'libraries'];
-  set libraries(String value) { jsElement[r'libraries'] = value; }
-
   /// Name of event fired when library is loaded and available.
   String get notifyEvent => jsElement[r'notifyEvent'];
   set notifyEvent(String value) { jsElement[r'notifyEvent'] = value; }
 
   /// If true, sign-in is enabled.
   /// See https://developers.google.com/maps/documentation/javascript/signedin#enable_sign_in
   bool get signedIn => jsElement[r'signedIn'];
   set signedIn(bool value) { jsElement[r'signedIn'] = value; }
 
   /// Version of the Maps API to use.
   String get version => jsElement[r'version'];
   set version(String value) { jsElement[r'version'] = value; }
 
   String get libraryUrl => jsElement[r'libraryUrl'];
   set libraryUrl(String value) { jsElement[r'libraryUrl'] = value; }
 
   String get mapsUrl => jsElement[r'mapsUrl'];
   set mapsUrl(String value) { jsElement[r'mapsUrl'] = value; }
 }