Revert of Update SSL/malware/net error interstitial design

chrome/browser/resources/security_warnings/interstitial_v2.js

Index: chrome/browser/resources/security_warnings/interstitial_v2.js
diff --git a/chrome/browser/resources/security_warnings/interstitial_v2.js b/chrome/browser/resources/security_warnings/interstitial_v2.js
index fe96d024d5439eb095cb07fbc57764045acdfb01..e9a846ad6b0a91bc70831b0d04f5d960e0e1cd14 100644
--- a/chrome/browser/resources/security_warnings/interstitial_v2.js
+++ b/chrome/browser/resources/security_warnings/interstitial_v2.js
@@ -139,14 +139,6 @@
   } 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');