Use standard font for print preview

components/dom_distiller/core/css/distilledpage.css

 /* 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. */
 
 /* Set the global 'box-sizing' state to 'border-box'.
  * *::after and *::before used to select pseudo-elements not selectable by *. */
 
 *,
 *::after,
 *::before {
@@ skipping 267 matching lines @@
     display: none;
   }
   #feedbackContainer {
     display: none;
   }
 
   /* Remove backgrounds and custom colors. */
   .light, .dark, .sepia {
       color: #000 !important;
       background-color: #fff !important;
+      font-family: sans-serif !important;
   }
 
   /* If the transition duration is unchanged, the above color changes
   happen after the document is ready for print. */
   body {
       transition-duration: unset !important;
   }
 }
 
 #content {
@@ skipping 190 matching lines @@
 }
 
 .youtubeIframe {
   height: 100%;
   left: 0px;
   position: absolute;
   top: 0px;
   width: 100%;
 }