[MD] Change appearance of incognito NTP to MD spec.

chrome/browser/resources/ntp4/guest_tab.css

Index: chrome/browser/resources/ntp4/guest_tab.css
diff --git a/chrome/browser/resources/ntp4/guest_tab.css b/chrome/browser/resources/ntp4/guest_tab.css
index ae24211242a82655230bcc71da188add71a12e7a..b3912c8c22f0a180bdc1ee9209322b5eb9e78bbd 100644
--- a/chrome/browser/resources/ntp4/guest_tab.css
+++ b/chrome/browser/resources/ntp4/guest_tab.css
@@ -2,30 +2,6 @@
  * 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;
-}
-
-html[dir='ltr'] .icon {
-  float: right;
-}
-
-html[dir='rtl'] .icon {
-  float: left;
-}
-
-.content {
-  background-color: #eee;
-  border-radius: 5px;
-  color: black;
-  margin-left: auto;
-  margin-right: auto;
-  margin-top: 66px;
-  max-width: 600px;
-  padding: 10px;
+a {
+  color: rgb(51, 103, 214);
 }