Remove third_party/polymer from .gitignore

third_party/polymer/v1_0/components/iron-flex-layout/iron-flex-layout.html

-<!--
-@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">
-
-<style is="custom-style">
-
-  :root {
-
-    --layout: {
-      display: -ms-flexbox;
-      display: -webkit-flex;
-      display: flex;
-    };
-
-    --layout-inline: {
-      display: -ms-inline-flexbox;
-      display: -webkit-inline-flex;
-      display: inline-flex;
-    };
-
-    --layout-horizontal: {
-      /* @apply(--layout); */
-      display: -ms-flexbox;
-      display: -webkit-flex;
-      display: flex;
-
-      -ms-flex-direction: row;
-      -webkit-flex-direction: row;
-      flex-direction: row;
-    };
-
-    --layout-horizontal-reverse: {
-      -ms-flex-direction: row-reverse;
-      -webkit-flex-direction: row-reverse;
-      flex-direction: row-reverse;
-    };
-
-    --layout-vertical: {
-      /* @apply(--layout); */
-      display: -ms-flexbox;
-      display: -webkit-flex;
-      display: flex;
-
-      -ms-flex-direction: column;
-      -webkit-flex-direction: column;
-      flex-direction: column;
-    };
-
-    --layout-vertical-reverse: {
-      -ms-flex-direction: column-reverse;
-      -webkit-flex-direction: column-reverse;
-      flex-direction: column-reverse;
-    };
-
-    --layout-wrap: {
-      -ms-flex-wrap: wrap;
-      -webkit-flex-wrap: wrap;
-      flex-wrap: wrap;
-    };
-
-    --layout-wrap-reverse: {
-      -ms-flex-wrap: wrap-reverse;
-      -webkit-flex-wrap: wrap-reverse;
-      flex-wrap: wrap-reverse;
-    };
-
-    --layout-flex-auto: {
-      -ms-flex: 1 1 auto;
-      -webkit-flex: 1 1 auto;
-      flex: 1 1 auto;
-    };
-
-    --layout-flex-none: {
-      -ms-flex: none;
-      -webkit-flex: none;
-      flex: none;
-    };
-
-    --layout-flex: {
-      -ms-flex: 1 1 0.000000001px;
-      -webkit-flex: 1;
-      flex: 1;
-      -webkit-flex-basis: 0.000000001px;
-      flex-basis: 0.000000001px;
-    };
-
-    --layout-flex-2: {
-      -ms-flex: 2;
-      -webkit-flex: 2;
-      flex: 2;
-    };
-
-    --layout-flex-3: {
-      -ms-flex: 3;
-      -webkit-flex: 3;
-      flex: 3;
-    };
-
-    --layout-flex-4: {
-      -ms-flex: 4;
-      -webkit-flex: 4;
-      flex: 4;
-    };
-
-    --layout-flex-5: {
-      -ms-flex: 5;
-      -webkit-flex: 5;
-      flex: 5;
-    };
-
-    --layout-flex-6: {
-      -ms-flex: 6;
-      -webkit-flex: 6;
-      flex: 6;
-    };
-
-    --layout-flex-7: {
-      -ms-flex: 7;
-      -webkit-flex: 7;
-      flex: 7;
-    };
-
-    --layout-flex-8: {
-      -ms-flex: 8;
-      -webkit-flex: 8;
-      flex: 8;
-    };
-
-    --layout-flex-9: {
-      -ms-flex: 9;
-      -webkit-flex: 9;
-      flex: 9;
-    };
-
-    --layout-flex-10: {
-      -ms-flex: 10;
-      -webkit-flex: 10;
-      flex: 10;
-    };
-
-    --layout-flex-11: {
-      -ms-flex: 11;
-      -webkit-flex: 11;
-      flex: 11;
-    };
-
-    --layout-flex-12: {
-      -ms-flex: 12;
-      -webkit-flex: 12;
-      flex: 12;
-    };
-
-    /* alignment in cross axis */
-
-    --layout-start: {
-      -ms-flex-align: start;
-      -webkit-align-items: flex-start;
-      align-items: flex-start;
-    };
-
-    --layout-center: {
-      -ms-flex-align: center;
-      -webkit-align-items: center;
-      align-items: center;
-    };
-
-    --layout-end: {
-      -ms-flex-align: end;
-      -webkit-align-items: flex-end;
-      align-items: flex-end;
-    };
-
-    /* alignment in main axis */
-
-    --layout-start-justified: {
-      -ms-flex-pack: start;
-      -webkit-justify-content: flex-start;
-      justify-content: flex-start;
-    };
-
-    --layout-center-justified: {
-      -ms-flex-pack: center;
-      -webkit-justify-content: center;
-      justify-content: center;
-    };
-
-    --layout-end-justified: {
-      -ms-flex-pack: end;
-      -webkit-justify-content: flex-end;
-      justify-content: flex-end;
-    };
-
-    --layout-around-justified: {
-      -ms-flex-pack: around;
-      -webkit-justify-content: space-around;
-      justify-content: space-around;
-    };
-
-    --layout-justified: {
-      -ms-flex-pack: justify;
-      -webkit-justify-content: space-between;
-      justify-content: space-between;
-    };
-
-    --layout-center-center: {
-      /* @apply(--layout-center --layout-center-justified); */
-      -ms-flex-align: center;
-      -webkit-align-items: center;
-      align-items: center;
-      -ms-flex-pack: center;
-      -webkit-justify-content: center;
-      justify-content: center;
-    };
-
-    /* self alignment */
-
-    --layout-self-start: {
-      -ms-align-self: flex-start;
-      -webkit-align-self: flex-start;
-      align-self: flex-start;
-    };
-
-    --layout-self-center: {
-      -ms-align-self: center;
-      -webkit-align-self: center;
-      align-self: center;
-    };
-
-    --layout-self-end: {
-      -ms-align-self: flex-end;
-      -webkit-align-self: flex-end;
-      align-self: flex-end;
-    };
-
-    --layout-self-stretch: {
-      -ms-align-self: stretch;
-      -webkit-align-self: stretch;
-      align-self: stretch;
-    };
-
-    /*******************************
-              Other Layout
-    *******************************/
-
-    --layout-block: {
-      display: block;
-    };
-
-    --layout-invisible: {
-      visibility: hidden !important;
-    };
-
-    --layout-relative: {
-      position: relative;
-    };
-
-    --layout-fit: {
-      position: absolute;
-      top: 0;
-      right: 0;
-      bottom: 0;
-      left: 0;
-    };
-
-    --layout-scroll: {
-      -webkit-overflow-scrolling: touch;
-      overflow: auto;
-    };
-
-    /* fixed position */
-
-    --layout-fixed-bottom:,
-    --layout-fixed-left:,
-    --layout-fixed-right:,
-    --layout-fixed-top: {
-      position: fixed;
-    };
-
-    --layout-fixed-top: {
-      top: 0;
-      left: 0;
-      right: 0;
-    };
-
-    --layout-fixed-right: {
-      top: 0;
-      right: 0;
-      bottom: 0;
-    };
-
-    --layout-fixed-bottom: {
-      right: 0;
-      bottom: 0;
-      left: 0;
-    };
-
-    --layout-fixed-left: {
-      top: 0;
-      bottom: 0;
-      left: 0;
-    };
-
-  }
-
-</style>