Remove third_party/polymer from .gitignore

third_party/polymer/v1_0/components/paper-item/paper-item.html

Index: third_party/polymer/v1_0/components/paper-item/paper-item.html
diff --git a/third_party/polymer/v1_0/components/paper-item/paper-item.html b/third_party/polymer/v1_0/components/paper-item/paper-item.html
deleted file mode 100644
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-<!--
-@license
-Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
-This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
-The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
-The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
-Code distributed by Google as part of the polymer project is also
-subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
--->
-
-<link rel="import" href="../polymer/polymer.html">
-<link rel="import" href="../iron-flex-layout/iron-flex-layout.html">
-<link rel="import" href="../paper-styles/paper-styles.html">
-
-<!--
-`<paper-item>` is a non-interactive list item. By default, it is a horizontal flexbox.
-
-    <paper-item>Item</paper-item>
-
-Use this element with `<paper-item-body>` to make Material Design styled two-line and three-line
-items.
-
-    <paper-item>
-      <paper-item-body two-line>
-        <div>Show your status</div>
-        <div secondary>Your status is visible to everyone</div>
-      </paper-item-body>
-      <iron-icon icon="warning"></iron-icon>
-    </paper-item>
-
-### Styling
-
-The following custom properties and mixins are available for styling:
-
-Custom property | Description | Default
-----------------|-------------|----------
-`--paper-item-min-height` | Minimum height of the item | `48px`
-`--paper-item`            | Mixin applied to the item  | `{}`
-
-### Accessibility
-
-This element has `role="listitem"` by default. Depending on usage, it may be more appropriate to set
-`role="menuitem"`, `role="menuitemcheckbox"` or `role="menuitemradio"`.
-
-    <paper-item role="menuitemcheckbox">
-      <paper-item-body>
-        Show your status
-      </paper-item-body>
-      <paper-checkbox></paper-checkbox>
-    </paper-item>
-
-@group Paper Elements
-@element paper-item
-@demo demo/index.html
--->
-
-<dom-module id="paper-item">
-
-  <link rel="import" type="css" href="paper-item-shared.css">
-
-  <style>
-
-    :host {
-      @apply(--layout-horizontal);
-      @apply(--layout-center);
-      @apply(--paper-font-subhead);
-
-      @apply(--paper-item);
-    }
-
-  </style>
-
-  <template>
-    <content></content>
-  </template>
-
-</dom-module>
-
-<script>
-
-(function() {
-
-  Polymer({
-
-    is: 'paper-item',
-
-    hostAttributes: {
-      role: 'listitem'
-    }
-
-  });
-
-})();
-
-</script>