Revert "Polymer elements added to third_party/polymer."

third_party/polymer/components/core-layout/core-layout-host.css

-/*
-Copyright (c) 2014 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: -webkit-box !important;
-  display: -ms-flexbox !important;
-  display: -moz-flex !important;
-  display: -webkit-flex !important;
-  display: flex !important;
-}
-  
-:host(.core-h) {
-  -webkit-box-orient: horizontal;
-  -ms-flex-direction: row;
-  -moz-flex-direction: row;
-  -webkit-flex-direction: row;
-  flex-direction: row;
-}
-  
-:host(.core-v) {
-  -webkit-box-orient: vertical;
-  -ms-flex-direction: column;
-  -moz-flex-direction: column;
-  -webkit-flex-direction: column;
-  flex-direction: column;
-}
-
-:host(.core-h.core-reverse) {
-  -webkit-box-direction: reverse;
-  -ms-flex-direction: row-reverse;
-  -moz-flex-direction: row-reverse;
-  -webkit-flex-direction: row-reverse;
-  flex-direction: row-reverse;
-}
-  
-:host(.core-v.core-reverse) {
-  -webkit-box-direction: reverse;
-  -ms-flex-direction: column-reverse;
-  -moz-flex-direction: column-reverse;
-  -webkit-flex-direction: column-reverse;
-  flex-direction: column-reverse;
-}
-
-/* alignment in main axis */
-:host(.core-justify-start) {
-  -webkit-box-pack: start;
-  -ms-flex-pack: start;
-  -moz-justify-content: flex-start;
-  -webkit-justify-content: flex-start;
-  justify-content: flex-start;
-}
-
-:host(.core-justify-center) {
-  -webkit-box-pack: center;
-  -ms-flex-pack: center;
-  -moz-justify-content: center;
-  -webkit-justify-content: center;
-  justify-content: center;
-}
-
-:host(.core-justify-end) {
-  -webkit-box-pack: end;
-  -ms-flex-pack: end;
-  -moz-justify-content: flex-end;
-  -webkit-justify-content: flex-end;
-  justify-content: flex-end;
-}
-
-:host(.core-justify-between) {
-  -webkit-box-pack: justify;
-  -ms-flex-pack: justify;
-  -moz-justify-content: space-between;
-  -webkit-justify-content: space-between;
-  justify-content: space-between;
-}
-
-/* alignment in cross axis */
-:host(.core-align-start) {
-  -webkit-box-align: start;
-  -ms-flex-align: start;
-  -moz-align-items: flex-start;
-  -webkit-align-items: flex-start;
-  align-items: flex-start;
-}
-
-:host(.core-align-center) {
-  -webkit-box-align: center;
-  -ms-flex-align: center;
-  -moz-align-items: center;
-  -webkit-align-items: center;
-  align-items: center;
-}
-  
-:host(.core-align-end) {
-  -webkit-box-align: end;
-  -ms-flex-align: end;
-  -moz-align-items: flex-end;
-  -webkit-align-items: flex-end;
-  align-items: flex-end;
-}