ChromeOS: Update styles of material design OOBE.

chrome/browser/resources/chromeos/login/oobe_dialog_parameters.css

+/* Copyright 2016 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. */
+
+iron-icon.oobe-icon {
+  --iron-icon-height: 32px;
+  --iron-icon-width: 32px;
+  color: var(--google-blue-500);
+}
+
+oobe-dialog .header {
+  color: rgba(0, 0, 0, 0.87);
+  font-family: Roboto, sans-serif;
+}
+
+oobe-dialog h1.title {
+  color: rgba(0, 0, 0, 0.87);
+  font-size: 28px;
+  margin: 36px 0 0 0; /* = 64 - font height*/
+}
+
+oobe-dialog .subtitle {
+  color: rgba(0, 0, 0, 0.87);
+  font-size: 13px;
+  margin: 27px 0 0 0; /* = 40 - line-height */
+}
+
+oobe-dialog .footer {
+  height: 100%;
+}
+
+oobe-dialog .bottom-buttons {
+  width: 100%
+}