Remove third_party/polymer from .gitignore

third_party/polymer/v1_0/components/paper-toggle-button/paper-toggle-button.css

-/*
-@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
-*/
-
-:host {
-  display: inline-block;
-}
-
-:host([disabled]) {
-  pointer-events: none;
-}
-
-:host(:focus) {
-  outline:none;
-}
-
-:host .toggle-bar {
-  background-color: var(--paper-toggle-button-unchecked-bar-color, #000000);
-}
-
-:host .toggle-button {
-  background-color: var(--paper-toggle-button-unchecked-button-color, --paper-grey-50);
-}
-
-:host([checked]) .toggle-bar {
-  background-color: var(--paper-toggle-button-checked-bar-color, --google-green-500);
-}
-
-:host([checked]) .toggle-button {
-  background-color: var(--paper-toggle-button-checked-button-color, --google-green-500);
-}
-
-:host .toggle-ink {
-  color: var(--paper-toggle-button-unchecked-ink-color, --primary-text-color);
-}
-
-:host([checked]) .toggle-ink {
-  color: var(--paper-toggle-button-checked-ink-color, --google-green-500);
-}
-
-/* ID selectors should not be overriden by users. */
-
-#toggleContainer {
-  position: relative;
-  width: 36px;
-  height: 14px;
-}
-
-#toggleBar {
-  position: absolute;
-  height: 100%;
-  width: 100%;
-  border-radius: 8px;
-  pointer-events: none;
-  opacity: 0.4;
-  transition: background-color linear .08s;
-}
-
-:host([checked]) #toggleBar {
-  opacity: 0.5;
-}
-
-:host([disabled]) #toggleBar {
-  background-color: #000;
-  opacity: 0.12;
-}
-
-#toggleButton {
-  position: absolute;
-  top: -3px;
-  height: 20px;
-  width: 20px;
-  border-radius: 50%;
-  box-shadow: 0 1px 5px 0 rgba(0, 0, 0, 0.6);
-  transition: -webkit-transform linear .08s, background-color linear .08s;
-  transition: transform linear .08s, background-color linear .08s;
-  will-change: transform;
-}
-
-#toggleButton.dragging {
-  -webkit-transition: none;
-  transition: none;
-}
-
-:host([checked]) #toggleButton {
-  -webkit-transform: translate(16px, 0);
-  transform: translate(16px, 0);
-}
-
-:host([disabled]) #toggleButton {
-  background-color: #bdbdbd;
-  opacity: 1;
-}
-
-#ink {
-  position: absolute;
-  top: -14px;
-  left: -14px;
-  width: 48px;
-  height: 48px;
-  opacity: 0.5;
-  pointer-events: none;
-}