Remove unneeded files from third_party/polymer.

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

Index: third_party/polymer/v1_0/components-chromium/iron-pages/README.md
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-
-<!---
-
-This README is automatically generated from the comments in these files:
-iron-pages.html
-
-Edit those files, and our readme bot will duplicate them over here!
-Edit this file, and the bot will squash your changes :)
-
-The bot does some handling of markdown. Please file a bug if it does the wrong
-thing! https://github.com/PolymerLabs/tedium/issues
-
--->
-
-[![Build Status](https://travis-ci.org/PolymerElements/iron-pages.svg?branch=master)](https://travis-ci.org/PolymerElements/iron-pages)
-
-_[Demo and API Docs](https://elements.polymer-project.org/elements/iron-pages)_
-
-
-##&lt;iron-pages&gt;
-
-`iron-pages` is used to select one of its children to show. One use is to cycle through a list of
-children "pages".
-
-Example:
-
-```html
-<iron-pages selected="0">
-  <div>One</div>
-  <div>Two</div>
-  <div>Three</div>
-</iron-pages>
-
-<script>
-  document.addEventListener('click', function(e) {
-    var pages = document.querySelector('iron-pages');
-    pages.selectNext();
-  });
-</script>
-```
-
-