Cleanup HTML/CSS bits left after NPAPI plugin removal.

remoting/webapp/base/html/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 555 matching lines @@
   margin-__MSG_@@bidi_start_edge__: -20px;
   margin-__MSG_@@bidi_end_edge__: 0;
   width: 20px;
   margin-top: 2px;
 }
 
 #current-email {
   color: rgba(0, 0, 0, 0.5);
 }
 
-#daemon-plugin-container {
-  width: 0;
-  height: 0;
-}
-
 .dialog-container {
   position: absolute;
   top: 200px;
   left: 0;
   width: 100%;
   z-index: 2;
 }
 
 .dialog-screen {
   position: absolute;
@@ skipping 20 matching lines @@
   overflow: scroll;
 }
 
 /* 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;
-}
-
 /* The NAT traversal state is independent of the app mode, and both need
  * to be combined to determine the visibility of the butter bar. We use
  * a style for the former and the 'hidden' property for the latter. */
 #nat-box.traversal-enabled {
   display: none;
 }
 
 #remember-pin {
   width: 315px;
 }
@@ skipping 113 matching lines @@
 }
 
 .mouse-cursor-overlay {
   position: absolute;
   pointer-events: none;
 }
 
 body.hangout-remote-desktop .home-screen {
   display: none;
 }