Fix chrome://history for supervised users on mobile

chrome/browser/resources/history/history.js

 // Copyright (c) 2012 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.
 
 <include src="../uber/uber_utils.js">
 <include src="history_focus_manager.js">
 
 ///////////////////////////////////////////////////////////////////////////////
 // Globals:
 /** @const */ var RESULTS_PER_PAGE = 150;
@@ skipping 174 matching lines @@
   var useMonthDate = propertyBag.useMonthDate || false;
   var focusless = propertyBag.focusless || false;
   var node = createElementWithClassName('li', 'entry');
   var time = createElementWithClassName('span', 'time');
   var entryBox = createElementWithClassName('div', 'entry-box');
   var domain = createElementWithClassName('div', 'domain');
 
   this.id_ = this.model_.getNextVisitId();
   var self = this;
 
-  // Only create the checkbox if it can be used either to delete an entry or to
-  // block/allow it.
+  // Only create the checkbox if it can be used to delete an entry.
   if (this.model_.editingEntriesAllowed) {
     var checkbox = document.createElement('input');
     checkbox.type = 'checkbox';
     checkbox.id = 'checkbox-' + this.id_;
     checkbox.time = this.date.getTime();
     checkbox.setAttribute('aria-label', loadTimeData.getStringF(
         'entrySummary',
         this.dateTimeOfDay,
         this.starred_ ? loadTimeData.getString('bookmarked') : '',
         this.title_,
@@ skipping 63 matching lines @@
     if (addTitleFavicon)
       this.addFaviconToElement_(visitEntryWrapper);
 
     if (focusless)
       title.querySelector('a').tabIndex = -1;
 
     visitEntryWrapper.appendChild(domain);
   }
 
   if (isMobileVersion()) {
-    var removeButton = createElementWithClassName('button', 'remove-entry');
-    removeButton.setAttribute('aria-label',
-                              loadTimeData.getString('removeFromHistory'));
-    removeButton.classList.add('custom-appearance');
-    removeButton.addEventListener(
-        'click', this.removeEntryFromHistory_.bind(this));
-    entryBox.appendChild(removeButton);
+    if (this.model_.editingEntriesAllowed) {
+      var removeButton = createElementWithClassName('button', 'remove-entry');
+      removeButton.setAttribute('aria-label',
+                                loadTimeData.getString('removeFromHistory'));
+      removeButton.classList.add('custom-appearance');
+      removeButton.addEventListener(
+          'click', this.removeEntryFromHistory_.bind(this));
+      entryBox.appendChild(removeButton);
 
-    // Support clicking anywhere inside the entry box.
-    entryBox.addEventListener('click', function(e) {
-      if (!e.defaultPrevented) {
-        self.titleLink.focus();
-        self.titleLink.click();
-      }
-    });
+      // Support clicking anywhere inside the entry box.
+      entryBox.addEventListener('click', function(e) {
+        if (!e.defaultPrevented) {
+          self.titleLink.focus();
+          self.titleLink.click();
+        }
+      });
+    }
   } else {
     var dropDown = createElementWithClassName('button', 'drop-down');
     dropDown.value = 'Open action menu';
     dropDown.title = loadTimeData.getString('actionMenuDescription');
     dropDown.setAttribute('menu', '#action-menu');
     dropDown.setAttribute('aria-haspopup', 'true');
 
     if (focusless)
       dropDown.tabIndex = -1;
 
@@ skipping 2092 matching lines @@
     historyView.reload();
 }
 
 // Add handlers to HTML elements.
 document.addEventListener('DOMContentLoaded', load);
 
 // This event lets us enable and disable menu items before the menu is shown.
 document.addEventListener('canExecute', function(e) {
   e.canExecute = true;
 });