update elements and fix some bugs

lib/iron_iconset_svg.dart

 // DO NOT EDIT: auto-generated with `pub run custom_element_apigen:update`
 
 /// Dart API for the polymer element `iron_iconset_svg`.
 @HtmlImport('iron_iconset_svg_nodart.html')
 library polymer_elements.lib.src.iron_iconset_svg.iron_iconset_svg;
 
 import 'dart:html';
 import 'dart:js' show JsArray, JsObject;
 import 'package:web_components/web_components.dart';
 import 'package:polymer_interop/polymer_interop.dart';
 import 'iron_meta.dart';
 
 /// The `iron-iconset-svg` element allows users to define their own icon sets
 /// that contain svg icons. The svg icon elements should be children of the
 /// `iron-iconset-svg` element. Multiple icons should be given distinct id's.
 ///
 /// Using svg elements to create icons has a few advantages over traditional
-/// bitmap graphics like jpg or png. Icons that use svg are vector based so they
-/// are resolution independent and should look good on any device. They are
-/// stylable via css. Icons can be themed, colorized, and even animated.
+/// bitmap graphics like jpg or png. Icons that use svg are vector based so
+/// they are resolution independent and should look good on any device. They
+/// are stylable via css. Icons can be themed, colorized, and even animated.
 ///
 /// Example:
 ///
 ///     <iron-iconset-svg name="my-svg-icons" size="24">
 ///       <svg>
 ///         <defs>
 ///           <g id="shape">
 ///             <rect x="50" y="50" width="50" height="50" />
 ///             <circle cx="50" cy="50" r="50" />
 ///           </g>
@@ skipping 20 matching lines @@
   /// The size of an individual icon. Note that icons must be square.
   num get size => jsElement[r'size'];
   set size(num value) { jsElement[r'size'] = value; }
 
   /// Applies an icon to the given element.
   ///
   /// An svg icon is prepended to the element's shadowRoot if it exists,
   /// otherwise to the element itself.
   /// [element]: Element to which the icon is applied.
   /// [iconName]: Name of the icon to apply.
-  Element applyIcon(Element element, String iconName) =>
+  applyIcon(Element element, String iconName) =>
       jsElement.callMethod('applyIcon', [element, iconName]);
 
   /// Construct an array of all icon names in this iconset.
   getIconNames() =>
       jsElement.callMethod('getIconNames', []);
 
   /// Remove an icon from the given element by undoing the changes effected
   /// by `applyIcon`.
   /// [element]: The element from which the icon is removed.
   removeIcon(Element element) =>
       jsElement.callMethod('removeIcon', [element]);
 }