Remove "Show saved copy" button from error page

components/neterror/resources/neterror.js

 // 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.
 
 function toggleHelpBox() {
   var helpBoxOuter = document.getElementById('details');
   helpBoxOuter.classList.toggle('hidden');
   var detailsButton = document.getElementById('details-button');
   if (helpBoxOuter.classList.contains('hidden'))
     detailsButton.innerText = detailsButton.detailsText;
@@ skipping 102 matching lines @@
     errorPageController.showSavedCopyButtonClick();
   }
 }
 
 function showOfflinePagesButtonClick() {
   if (window.errorPageController) {
     errorPageController.showOfflinePagesButtonClick();
   }
 }
 
-function showOfflineCopyButtonClick() {
-  if (window.errorPageController) {
-    errorPageController.showOfflineCopyButtonClick();
-  }
-}
-
 function detailsButtonClick() {
   if (window.errorPageController)
     errorPageController.detailsButtonClick();
 }
 
 /**
  * Replace the reload button with the Google cached copy suggestion.
  */
 function setUpCachedButton(buttonStrings) {
   var reloadButton = document.getElementById('reload-button');
@@ skipping 18 matching lines @@
 primaryControlOnLeft = false;
 </if>
 
 function onDocumentLoad() {
   var controlButtonDiv = document.getElementById('control-buttons');
   var reloadButton = document.getElementById('reload-button');
   var detailsButton = document.getElementById('details-button');
   var showSavedCopyButton = document.getElementById('show-saved-copy-button');
   var showOfflinePagesButton =
       document.getElementById('show-offline-pages-button');
-  var showOfflineCopyButton =
-      document.getElementById('show-offline-copy-button');
 
   var reloadButtonVisible = loadTimeData.valueExists('reloadButton') &&
       loadTimeData.getValue('reloadButton').msg;
   var showSavedCopyButtonVisible =
       loadTimeData.valueExists('showSavedCopyButton') &&
       loadTimeData.getValue('showSavedCopyButton').msg;
   var showOfflinePagesButtonVisible =
       loadTimeData.valueExists('showOfflinePagesButton') &&
       loadTimeData.getValue('showOfflinePagesButton').msg;
-  var showOfflineCopyButtonVisible =
-      loadTimeData.valueExists('showOfflineCopyButton') &&
-      loadTimeData.getValue('showOfflineCopyButton').msg;
 
   var primaryButton, secondaryButton;
   if (showSavedCopyButton.primary) {
     primaryButton = showSavedCopyButton;
     secondaryButton = reloadButton;
   } else {
     primaryButton = reloadButton;
     secondaryButton = showSavedCopyButton;
   }
 
   // Sets up the proper button layout for the current platform.
   if (primaryControlOnLeft) {
     buttons.classList.add('suggested-left');
     controlButtonDiv.insertBefore(secondaryButton, primaryButton);
   } else {
     buttons.classList.add('suggested-right');
     controlButtonDiv.insertBefore(primaryButton, secondaryButton);
   }
 
   // Check for Google cached copy suggestion.
   if (loadTimeData.valueExists('cacheButton')) {
     setUpCachedButton(loadTimeData.getValue('cacheButton'));
   }
 
   if (reloadButton.style.display == 'none' &&
       showSavedCopyButton.style.display == 'none' &&
-      showOfflinePagesButton.style.display == 'none' &&
-      showOfflineCopyButton.style.display == 'none') {
+      showOfflinePagesButton.style.display == 'none') {
     detailsButton.classList.add('singular');
   }
 
   // Show control buttons.
   if (reloadButtonVisible || showSavedCopyButtonVisible ||
-      showOfflinePagesButtonVisible || showOfflineCopyButton) {
+      showOfflinePagesButtonVisible) {
     controlButtonDiv.hidden = false;
 
     // Set the secondary button state in the cases of two call to actions.
-    if ((reloadButtonVisible || showOfflinePagesButtonVisible ||
-         showOfflineCopyButton) &&
+    if ((reloadButtonVisible || showOfflinePagesButtonVisible) &&
         showSavedCopyButtonVisible) {
       secondaryButton.classList.add('secondary-button');
     }
   }
 }
 
 document.addEventListener('DOMContentLoaded', onDocumentLoad);