Tidied up some divs and css classes + improved usability

chrome/test/data/webrtc/manual/peerconnection_manual.js

 /**
  * 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.
  */
 
  /**
  * See http://dev.w3.org/2011/webrtc/editor/getusermedia.html for more
  * information on getUserMedia. See
  * http://dev.w3.org/2011/webrtc/editor/webrtc.html for more information on
@@ skipping 560 matching lines @@
 
 /**
  * Creates a peer connection. Must be called before most other public functions
  * in this file.
  */
 function preparePeerConnection() {
   if (global.peerConnection != null)
     error_('creating peer connection, but we already have one.');
 
   global.peerConnection = createPeerConnection(STUN_SERVER);
-  print_('ok-peerconnection-created');
+  success_('ok-peerconnection-created');
 }
 
 /**
  * Adds the local stream to the peer connection. You will have to re-negotiate
  * the call for this to take effect in the call.
  */
 function addLocalStream() {
   if (global.peerConnection == null)
     error_('adding local stream, but we have no peer connection.');
 
@@ skipping 798 matching lines @@
 
 /** @private */
 function readResponseHeader_(request, key) {
   var value = request.getResponseHeader(key);
   if (value == null || value.length == 0) {
     error_('Received empty value ' + value +
            ' for response header key ' + key + '.');
   }
   return parseInt(value);
 }