Update incognito and guest browsing new tab page:

chrome/browser/resources/ntp4/incognito_guest_tab.css

Index: chrome/browser/resources/ntp4/incognito_guest_tab.css
diff --git a/chrome/browser/resources/ntp4/incognito_guest_tab.css b/chrome/browser/resources/ntp4/incognito_guest_tab.css
new file mode 100644
index 0000000000000000000000000000000000000000..b35191dec11dc3364a0c9aa93c861c0497fda786
--- /dev/null
+++ b/chrome/browser/resources/ntp4/incognito_guest_tab.css
@@ -0,0 +1,66 @@
+/* Copyright 2014 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. */

[Evan Stade, 2014/04/22 17:52:52]

nit: file-level comment ("this is the css shared by incognito NTP and guest
NTP...")

also, file name should be incognito_and_guest_ntp.css or something because
currently it sounds like the intersection rather than union of incognito and
guest modes.

[edwardjung, 2014/04/23 10:42:10]

Done.

+
+html {
+  background: #fafafa;
+}
+
+body {
+  line-height: 1.5;
+}
+
+h1 {
+  font-size: 1.7em;
+  font-weight: normal;
+  line-height: 1.2em;
+  margin-top: 0;
+}
+
+a {
+  color: rgb(39, 110, 242);
+  text-decoration: none;
+}
+
+a:hover {
+  text-decoration: underline;
+}
+
+.content {
+  background-color: white;
+  border-radius: 2px;
+  box-shadow: 0 4px 6px 1px rgba(50, 50, 50, 0.14);
+  box-sizing: border-box;
+  color: black;
+  line-height: 1.5;
+  margin: 5.5em auto 0;
+  max-width: 640px;
+  padding: 30px 35px 30px 37px;
+  width: 100%;
+}
+
+.content > span {
+  display: block;
+}
+
+.content p:last-child {
+  margin-bottom: 4px;
+}
+
+@media (max-width:700px) {
+  body {
+    margin: 3em 2em 2em;
+  }
+}
+
+@media (max-width:400px) {
+  body {
+    margin: 3em 1.5em 2em;
+  }
+}
+
+@media (max-height:480px) and (max-width:400px) {
+  .content {
+    margin: auto;
+  }
+}