MD Extensions: Fix sidebar icons by including iron-icons.html

chrome/browser/resources/md_extensions/icons.html

 <link rel="import" href="chrome://resources/html/polymer.html">
+<link rel="import" href="chrome://resources/polymer/v1_0/iron-icons/iron-icons.html">

[Devlin, 2016/05/05 15:55:01]

Shouldn't this be imported by sidebar.html instead?

[michaelpg, 2016/05/05 16:10:15]

I'm ambivalent: either make icons.html the "hub" which lists and imports all the
icons Extensions uses, or import iron-icons.html from any file which uses
iron-icons.

Feel free to push your fix instead.

 <link rel="import" href="chrome://resources/polymer/v1_0/iron-iconset-svg/iron-iconset-svg.html">
 
 <iron-iconset-svg name="extensions-icons" size="24">
   <svg>
     <defs>
       <g id="pack">
         <path d="M0 0h24v24H0z" fill="none"></path>
         <path d="M19 3H5c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h14c1.1 0 2-.9 2-2V5c0-1.1-.9-2-2-2zm-5 6h-2v2h2v2h-2v-2h-2V9h2V7h-2V5h2v2h2v2zm0 8h-2v-2h-2v-2h2v2h2v2z"></path>
       </g>
       <g id="update">
         <defs>
           <path id="a" d="M0 0h24v24H0V0z"></path>
         </defs>
         <clipPath id="b">
           <use xlink:href="#a" overflow="visible"></use>
         </clipPath>
         <path d="M7.3 5.3c-1.3 1.3-2 3-2 4.7 0 1.7.7 3.4 2 4.7l1.2-1.2c-1-1-1.5-2.3-1.5-3.5 0-1.3.5-2.6 1.5-3.5L7.3 5.3zm11.8-2.4l-1.2 1.2c1.6 1.6 2.4 3.8 2.4 5.9s-.8 4.3-2.4 5.9l1.2 1.2c2-2 2.9-4.5 2.9-7.1s-1-5.1-2.9-7.1zm-13 1.2L4.9 2.9C3 4.9 2 7.4 2 10s1 5.1 2.9 7.1l1.2-1.2c-1.6-1.6-2.4-3.8-2.4-5.9s.8-4.3 2.4-5.9zm10.6 1.2l-1.2 1.2c1 1 1.5 2.3 1.5 3.5 0 1.3-.5 2.6-1.5 3.5l1.2 1.2c1.3-1.3 2-3 2-4.7-.1-1.7-.7-3.4-2-4.7zM12 7.5c-1.4 0-2.5 1.1-2.5 2.5 0 1 .6 1.9 1.5 2.3V21h2v-8.7c.9-.4 1.5-1.3 1.5-2.3 0-1.4-1.1-2.5-2.5-2.5z" clip-path="url(#b)"></path>
       </g>
   </svg>
 </iron-icon-set>