Disable scroll-bars in shrink-to-fit mode.

remoting/webapp/main.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, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p,
 blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em,
 font, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, dl,
 dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody,
 tfoot, thead, tr, th, td, button {
@@ skipping 581 matching lines @@
 .dialog-screen {
   position: fixed;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
   background-color: #fff;
   opacity: 0.75;
 }
 
+/* TODO(jamiewalch): crbug.com/252796: Remove this once crbug.com/240772
+ * is fixed. */
+.no-scroll {
+  overflow: hidden;
+}
+
 /* TODO(jamiewalch): Reinstate this if we're able to get translations for
  *     "Why is this safe?" that don't overflow in any language.
 #host-setup-dialog {
   width: 460px;
 }
 */
 
 #host-plugin-container {
   width: 0;
   height: 0;
@@ skipping 37 matching lines @@
   box-sizing: border-box;
 }
 
 /*
  * Setting hidden on elements that match some rule overriding 'display' doesn't
  * do what you would expect unless this is made explicit (and !important).
  */
 [hidden] {
   display: none !important;
 }