Simplify the incognito NTP.

chrome/browser/resources/incognito_tab.css

 /* Copyright (c) 2012 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. */
 
 body {
   margin: 10px 8px;
 }
 
 .icon {
   -webkit-margin-end: 3px;
   -webkit-margin-start: 6px;
+  position: absolute;
+  top: -7px;
 }
 
 html[dir='ltr'] .icon {
   -webkit-transform: scaleX(-1);
-  float: right;
+  left: auto;
+  right: 10px;
 }
 
 html[dir='rtl'] .icon {
-  float: left;
+  left: 10px;
+  right: auto;
 }
 
 .content {
-  background-color: #eee;
+  background-color: #eaeaea;
+  border: 1px solid #d9d9d9;
   border-radius: 5px;
+  box-shadow: 0 3px 5px rgba(0, 0, 0, 0.25);
   color: black;
   margin-left: auto;
   margin-right: auto;
   margin-top: 66px;
   max-width: 600px;
-  padding: 10px;
-}
-
-.extensions-message {
-  -webkit-padding-start: 39px;
-  margin-top: 15px;
+  padding: 10px 10px 0;
   position: relative;
 }
 
-.extension-icon {
-  left: 0;
-  margin-top: -15px;
-  position: absolute;
-  right: 0;
-  top: 50%;
-  width: 30px;
+h1 {
+  font-size: 1.25em;
+  margin: 0;
 }
+
+p {
+  margin: 1em 0;
+}