[MD settings] adding settings-row class

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

Index: chrome/browser/resources/settings/settings_page/settings_row.css
diff --git a/chrome/browser/resources/settings/settings_page/settings_row.css b/chrome/browser/resources/settings/settings_page/settings_row.css
new file mode 100644
index 0000000000000000000000000000000000000000..1883fd1bdc216cb6cb3dcd6e5b236d64f399c04d
--- /dev/null
+++ b/chrome/browser/resources/settings/settings_page/settings_row.css
@@ -0,0 +1,14 @@
+/* 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. */
+
+:host {
+  @apply(--layout-center);
+  @apply(--layout-horizontal);
+  border-bottom: 1px solid #e0e0e0;
+  padding: 8px 16px;
+}
+
+:host(:last-of-type) {
+  border-bottom: none;
+}