MD Settings: replace paper-material with paper-material-shared-styles

chrome/browser/resources/settings/settings_page/settings_section.css

-/* Copyright 2015 The Chromium Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file. */
-
-/**
- * @fileoverview
- * Common styles for Settings pages.
- */
-:host {
-  display: flex;
-  flex-direction: column;
-  position: relative;
-}
-
-#header {
-  margin-bottom: 12px;
-}
-
-#header .title {
-  color: rgb(104, 113, 116);  /* Custom color from bettes@ */
-  font-size: 13px;
-  font-weight: 500;
-}
-
-#card {
-  background-color: white;
-  overflow: hidden;
-}
-
-#card {
-  flex: 1;
-}
-
-:host(.expanded) {
-  margin-bottom: 0;
-}
-
-:host(.expanded) #header {
-  display: none;
-}
-
-:host(.frozen) #card {
-  position: fixed;
-  width: 100%;
-}
-
-:host(.expanded.frozen) #card {
-  position: relative;
-}