Remove unneeded files from third_party/polymer.

third_party/polymer/v1_0/components-chromium/paper-styles/README.md

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-paper-styles.html
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-[![Build status](https://travis-ci.org/PolymerElements/paper-styles.svg?branch=master)](https://travis-ci.org/PolymerElements/paper-styles)
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-_[Demo and API docs](https://elements.polymer-project.org/elements/paper-styles)_
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-##&lt;paper-styles&gt;
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-The `<paper-styles>` component provides simple ways to use Material Design CSS styles
-in your application. The following imports are available:
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-1. [color.html](https://github.com/PolymerElements/paper-styles/blob/master/color.html):
-a complete list of the colors defined in the Material Design [palette](https://www.google.com/design/spec/style/color.html)
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-1. [default-theme.html](https://github.com/PolymerElements/paper-styles/blob/master/default-theme.html): text,
-background and accent colors that match the default Material Design theme
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-1. [shadow.html](https://github.com/PolymerElements/paper-styles/blob/master/shadow.html): Material Design
-[elevation](https://www.google.com/design/spec/what-is-material/elevation-shadows.html) and shadow styles
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-1. [typography.html](https://github.com/PolymerElements/paper-styles/blob/master/typography.html):
-Material Design [font](http://www.google.com/design/spec/style/typography.html#typography-styles) styles and sizes
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-1. [demo-pages.html](https://github.com/PolymerElements/paper-styles/blob/master/demo-pages.html): generic styles
-used in the PolymerElements demo pages
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-We recommend importing each of these individual files, and using the style mixins
-available in each ones, rather than the aggregated `paper-styles.html` as a whole.
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