Remove third_party/polymer from .gitignore

third_party/polymer/v1_0/components/paper-checkbox/paper-checkbox.css

-/*
-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;
-  white-space: nowrap;
-}
-
-:host(:focus) {
-  outline: none;
-}
-
-.hidden {
-  display: none;
-}
-
-#checkboxContainer {
-  display: inline-block;
-  position: relative;
-  width: 18px;
-  height: 18px;
-  cursor: pointer;
-  -webkit-transform: translateZ(0);
-  transform: translateZ(0);
-  vertical-align: middle;
-  background-color: var(--paper-checkbox-unchecked-background-color, transparent);
-}
-
-:host #ink {
-  position: absolute;
-  top: -15px;
-  left: -15px;
-  width: 48px;
-  height: 48px;
-  color: var(--paper-checkbox-unchecked-ink-color, --primary-text-color);
-  opacity: 0.6;
-  pointer-events: none;
-}
-
-:host #ink[checked] {
-  color: var(--paper-checkbox-checked-ink-color, --default-primary-color);
-}
-
-:host #checkbox {
-  position: relative;
-  box-sizing: border-box;
-  height: 100%;
-  border: solid 2px;
-  border-color: var(--paper-checkbox-unchecked-color, --primary-text-color);
-  border-radius: 2px;
-  pointer-events: none;
-  -webkit-transition: background-color 140ms, border-color 140ms;
-  transition: background-color 140ms, border-color 140ms;
-}
-
-/* checkbox checked animations */
-#checkbox.checked #checkmark {
-  -webkit-animation: checkmark-expand 140ms ease-out forwards;
-  animation: checkmark-expand 140ms ease-out forwards;
-}
-
-@-webkit-keyframes checkmark-expand {
-  0% {
-    top: 9px;
-    left: 6px;
-    width: 0px;
-    height: 0px;
-  }
-  100% {
-    top: -1px;
-    left: 4px;
-    width: 5px;
-    height: 10px;
-  }
-}
-
-@keyframes checkmark-expand {
-  0% {
-    top: 9px;
-    left: 6px;
-    width: 0px;
-    height: 0px;
-  }
-  100% {
-    top: -1px;
-    left: 4px;
-    width: 5px;
-    height: 10px;
-  }
-}
-
-:host #checkbox.checked {
-  background-color: var(--paper-checkbox-checked-color, --default-primary-color);
-  border-color: var(--paper-checkbox-checked-color, --default-primary-color);
-}
-
-:host #checkmark {
-  -webkit-transform: rotate(45deg);
-  transform: rotate(45deg);
-  position: absolute;
-  top: -1px;
-  left: 4px;
-  width: 5px;
-  height: 10px;
-  border-style: solid;
-  border-top: none;
-  border-left: none;
-  border-right-width: 2px;
-  border-bottom-width: 2px;
-  border-color: var(--paper-checkbox-checkmark-color, white);
-}
-
-/* label */
-#checkboxLabel {
-  position: relative;
-  display: inline-block;
-  vertical-align: middle;
-  padding-left: 8px;
-  white-space: normal;
-  pointer-events: none;
-  color: var(--paper-checkbox-label-color, --primary-text-color);
-}
-
-#checkboxLabel[hidden] {
-  display: none;
-}
-
-/* disabled state */
-:host([disabled]) {
-  pointer-events: none;
-}
-
-:host([disabled]) #checkbox {
-  opacity: 0.5;
-  border-color: var(--paper-checkbox-unchecked-color, --primary-text-color);
-}
-
-:host([disabled][checked]) #checkbox {
-  background-color: var(--paper-checkbox-unchecked-color, --primary-text-color);
-  opacity: 0.5;
-}
-
-:host([disabled]) #checkboxLabel  {
-  opacity: 0.65;
-}