ChromeOS OOBE: Update Welcome dialog to better accomodate CfM messages.

chrome/browser/resources/chromeos/login/oobe_welcome_dialog.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. */
 
 .vertical-margin {
   width: 22px; /* = 24 - (button border 2px) */
 }
 
 #bottom-margin {
   height: 24px;
 }
 
 #title {
   color: rgba(0, 0, 0, 0.87);
   font-family: Roboto, sans-serif;
-  font-size: 38px;
+  font-size: 32px;
   font-weight: 300; /* roboto-light */
-  margin: 120px 0 30px 0;
+  height: 80px;
+  line-height: 40px;
+  margin: 120px 80px 30px 80px;
+  text-align: center;
 }
 
 #welcomeIllustration {
   padding-top: 14px;
 }
 
 oobe-welcome-secondary-button {
   margin-right: 8px;
 }
 
 #buttons {
   width: 100%;
 }