Upgrade to 1.0 and switch clients to dom-repeat where needed.

third_party/polymer/v0_8/components/paper-item/paper-icon-item.html

 <!--
-    @license
-    Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
-    This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
-    The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
-    The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
-    Code distributed by Google as part of the polymer project is also
-    subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+@license
+Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 
 <link rel="import" href="../polymer/polymer.html">
 <link rel="import" href="../paper-styles/paper-styles.html">
 
 <!--
-`paper-icon-item` is a list item with a fixed-width icon area.
+`<paper-icon-item>` is a convenience element to make an item with icon. It is a non interactive list
+item with a fixed-width icon area, according to Material Design. This is useful if the icons are of
+varying widths, but you want the item bodies to line up. Use this like a `<paper-item>`. The child
+node with the attribute `item-icon` is placed in the icon area.
 
-@element paper-icon-item
+    <paper-icon-item>
+      <iron-icon icon="favorite" item-icon></iron-icon>
+      Favorite
+    </paper-icon-item>
+    <paper-icon-item>
+      <div class="avatar" item-icon></div>
+      Avatar
+    </paper-icon-item>
+
+### Styling
+
+The following custom properties and mixins are available for styling:
+
+Custom property | Description | Default
+----------------|-------------|----------
+`--paper-item-icon-width` | Width of the icon area     | `56px`
+`--paper-icon-item`       | Mixin applied to the item  | `{}`
+
 -->
 
 <dom-module id="paper-icon-item">
 
   <link rel="import" type="css" href="paper-item-shared.css">
 
   <style>
 
     :host {
-      mixin(--layout-horizontal);
-      mixin(--layout-center);
-      mixin(--paper-font-subhead);
+      @apply(--layout-horizontal);
+      @apply(--layout-center);
+      @apply(--paper-font-subhead);
 
-      mixin(--paper-item);
-      mixin(--paper-icon-item);
+      @apply(--paper-item);
+      @apply(--paper-icon-item);
+    }
+
+    .content-icon {
+      width: var(--paper-item-icon-width, 56px);
     }
 
   </style>
 
   <template>
     <div id="contentIcon" class="content-icon layout horizontal center">
       <content select="[item-icon]"></content>
     </div>
     <content></content>
   </template>
 
 </dom-module>
 
 <script>
 
 (function() {
 
   Polymer({
 
     is: 'paper-icon-item',
 
-    enableCustomStyleProperties: true,
-
     hostAttributes: {
       'role': 'listitem'
-    },
-
-    properties: {
-
-      /**
-       * The width of the icon area.
-       *
-       * @attribute iconWidth
-       * @type String
-       * @default '56px'
-       */
-      iconWidth: {
-        type: String,
-        value: '56px'
-      }
-
-    },
-
-    ready: function() {
-      this.$.contentIcon.style.width = this.iconWidth;
     }
 
   });
 
 })();
 
 </script>