Settings Rewrite: Make a common settings-section component.

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 > paper-material {
+  @apply(--shadow-elevation-4dp);
+  background-color: white;
+  margin: 16px;
+  width: 605px;
+}
+
+.header {
+  @apply(--layout-horizontal);
+  @apply(--layout-center);
+  background-color: #f8f8f8;
+  border-bottom: 1px solid rgba(0, 0, 0, .1);
+  padding: 16px;
+}
+
+.header iron-icon {
+  -webkit-padding-end: 16px;
+  color: rgba(0, 0, 0, .87);
+}
+
+.header .title {
+  @apply(--paper-font-body2);
+}
+
+div.content-container {
+  padding: 16px;
+}