Remove unneeded files from third_party/polymer.

third_party/polymer/v1_0/components-chromium/iron-iconset-svg/README.md

-
-<!---
-
-This README is automatically generated from the comments in these files:
-iron-iconset-svg.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-iconset-svg.svg?branch=master)](https://travis-ci.org/PolymerElements/iron-iconset-svg)
-
-_[Demo and API Docs](https://elements.polymer-project.org/elements/iron-iconset-svg)_
-
-
-##&lt;iron-iconset-svg&gt;
-
-
-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.
-
-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>
-        </defs>
-      </svg>
-    </iron-iconset-svg>
-
-This will automatically register the icon set "my-svg-icons" to the iconset
-database.  To use these icons from within another element, make a
-`iron-iconset` element and call the `byId` method
-to retrieve a given iconset. To apply a particular icon inside an
-element use the `applyIcon` method. For example:
-
-    iconset.applyIcon(iconNode, 'car');
-
-