Update Polymer from 1.2.1 -> 1.2.3

third_party/polymer/v1_0/components-chromium/iron-icons/README.md

-iron-icons
-=========
 
-## Building
-Running `update-icons.sh` will checkout [material-design-icons](https://github.com/google/material-design-icons), reduce
-the fileset to 24px svgs, and compile the iconsets.
+<!---
+
+This README is automatically generated from the comments in these files:
+iron-icons.html
+
+Edit those files, and our readme bot will duplicate them over here!
+Edit this file, and the bot will squash your changes :)
+
+-->
+
+[![Build Status](https://travis-ci.org/PolymerElements/iron-icons.svg?branch=master)](https://travis-ci.org/PolymerElements/iron-icons)
+
+_[Demo and API Docs](https://elements.polymer-project.org/elements/iron-icons)_
+
+
+##&lt;iron-icons&gt;
+
+
+`iron-icons` is a utility import that includes the definition for the `iron-icon` element, `iron-iconset-svg` element, as well as an import for the default icon set.
+
+The `iron-icons` directory also includes imports for additional icon sets that can be loaded into your project.
+
+Example loading icon set:
+
+    <link rel="import" href="../iron-icons/maps-icons.html">
+
+To use an icon from one of these sets, first prefix your `iron-icon` with the icon set name, followed by a colon, ":", and then the icon id.
+
+Example using the directions-bus icon from the maps icon set:
+
+    <iron-icon icon="maps:directions-bus"></iron-icon>
+
+
+See [iron-icon](#iron-icon) for more information about working with icons.
+
+See [iron-iconset](#iron-iconset) and [iron-iconset-svg](#iron-iconset-svg) for more information about how to create a custom iconset.
+
+