Remove details strings used by iframes on network error pages

components/neterror/resources/neterror.css

 /* Copyright 2013 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. */
 
 /* Don't use the main frame div when the error is in a subframe. */
 html[subframe] #main-frame-error {
   display: none;
 }
 
 /* Don't use the subframe error div when the error is in a main frame. */
@@ skipping 250 matching lines @@
 
 #sub-frame-error {
   -webkit-align-items: center;
   background-color: #DDD;
   display: -webkit-flex;
   -webkit-flex-flow: column;
   height: 100%;
   -webkit-justify-content: center;
   left: 0;
   position: absolute;
+  text-align: center;
   top: 0;
   transition: background-color .2s ease-in-out;
   width: 100%;
 }
 
 #sub-frame-error:hover {
   background-color: #EEE;
 }
 
 #sub-frame-error .icon-generic {
@@ skipping 64 matching lines @@
   width: 100%;
 }
 
 /* Offline page */
 .offline {
   transition: -webkit-filter 1.5s cubic-bezier(0.65, 0.05, 0.36, 1),
               background-color 1.5s cubic-bezier(0.65, 0.05, 0.36, 1);
   will-change: -webkit-filter, background-color;
 }
 
+.offline #main-message > p {

[mmenke, 2016/06/27 14:24:04]

Where do we set the class of a DOM object to be "offline"?

[edwardjung, 2016/06/27 15:29:07]

This is set in neterror.js when the icon is switched.

https://cs.chromium.org/chromium/src/components/neterror/resources/neterror.j...

If the icon is 'icon-offline' this adds the class and activates the offline
easter egg. 

+  display: none;
+}
+
 .offline.inverted {
   -webkit-filter: invert(100%);
   background-color: #000;
 }
 
 .offline .interstitial-wrapper {
   color: #2b2b2b;
   font-size: 1em;
   line-height: 1.55;
   margin: 0 auto;
@@ skipping 112 matching lines @@
     overflow: inherit;
     padding: 0 8px;
   }
 }
 
 @media (max-width: 120px) {
   button {
     width: auto;
   }
 }