Fix apps page footer shrinking/overlap for small window sizes.

chrome/browser/resources/ntp4/new_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. */
 
 html {
   /* It's necessary to put this here instead of in body in order to get the
      background-size of 100% to work properly */
   height: 100%;
   overflow: hidden;
 }
@@ skipping 173 matching lines @@
   height: 49px;
 }
 
 #footer-content > * {
   margin: 0 9px;
 }
 
 #logo-img {
   display: inline-block;
   margin-top: 4px;
+  overflow: hidden;
   position: relative;
 }
 
 #promo-bubble-anchor {
   height: 1px;
   left: 0;
   position: absolute;
   top: 4px;
   visibility: hidden;
   width: 32px;
@@ skipping 258 matching lines @@
   padding: 0;
 }
 
 .other-sessions-promo-message:only-child {
   display: block;
 }
 
 .other-sessions-promo-message p {
   margin: 0;
 }