Revert of Update SSL/malware/net error interstitial design

chrome/browser/resources/security_warnings/interstitial_v2.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.
 
 // This is the shared code for the new (Chrome 37) security interstitials. It is
 // used for both SSL interstitials and Safe Browsing interstitials.
 
 var expandedDetails = false;
 var keyPressState = 0;
 
@@ skipping 121 matching lines @@
         sendCommand(SB_CMD_SHOW_DIAGNOSTIC);
     });
   }
 
   if (captivePortal) {
     // Captive portal page doesn't have details button.
     $('details-button').classList.add('hidden');
   } else {
     $('details-button').addEventListener('click', function(event) {
       var hiddenDetails = $('details').classList.toggle('hidden');
-
-      if (mobileNav) {
-        // Details appear over the main content on small screens.
-        $('main-content').classList.toggle('hidden', !hiddenDetails);
-      } else {
-        $('main-content').classList.remove('hidden');
-      }
-
       $('details-button').innerText = hiddenDetails ?
           loadTimeData.getString('openDetails') :
           loadTimeData.getString('closeDetails');
       if (!expandedDetails) {
         // Record a histogram entry only the first time that details is opened.
         sendCommand(ssl ? SSL_CMD_MORE : SB_CMD_EXPANDED_SEE_MORE);
         expandedDetails = true;
       }
     });
   }
 
   preventDefaultOnPoundLinkClicks();
   setupCheckbox();
   setupSSLDebuggingInfo();
   document.addEventListener('keypress', handleKeypress);
 }
 
 document.addEventListener('DOMContentLoaded', setupEvents);