Reverting this revert, since it does not seem to have caused the breakage.

chrome/browser/resources/options/language_options.js

 // Copyright (c) 2011 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.
 
 // TODO(kochi): Generalize the notification as a component and put it
 // in js/cr/ui/notification.js .
 
 cr.define('options', function() {
   const OptionsPage = options.OptionsPage;
   const LanguageList = options.LanguageList;
@@ skipping 75 matching lines @@
         // Listen to add language dialog ok button.
         var addLanguageOkButton = $('add-language-overlay-ok-button');
         addLanguageOkButton.addEventListener('click',
             this.handleAddLanguageOkButtonClick_.bind(this));
 
         // Show experimental features if enabled.
         if (templateData.experimentalSpellCheckFeatures == 'true')
           $('auto-spell-correction-option').hidden = false;
 
         // Handle spell check enable/disable.
-        Preferences.getInstance().addEventListener(this.enableSpellCheckPref,
-            this.updateEnableSpellCheck_.bind(this));
+        if (!cr.isMac) {
+          Preferences.getInstance().addEventListener(
+              this.enableSpellCheckPref,
+              this.updateEnableSpellCheck_.bind(this));
+        }
       }
 
       // Listen to user clicks on the "Change touch keyboard settings..."
       // button (if it exists).
       var virtualKeyboardButton = $('language-options-virtual-keyboard');
       if (virtualKeyboardButton) {
         // TODO(yusukes): would be better to hide the button if no virtual
         // keyboard is registered.
         virtualKeyboardButton.onclick = function(e) {
           OptionsPage.navigateToPage('virtualKeyboards');
@@ skipping 104 matching lines @@
       var match = document.location.hash.match(/\blang=([\w-]+)/);
       if (match) {
         var specifiedLanguageCode = match[1];
         if (languageOptionsList.selectLanguageByCode(specifiedLanguageCode)) {
           languageCode = specifiedLanguageCode;
         }
       }
       this.updateSelectedLanguageName_(languageCode);
       if (cr.isWindows || cr.isChromeOS)
         this.updateUiLanguageButton_(languageCode);
-      this.updateSpellCheckLanguageButton_(languageCode);
+      if (!cr.isMac)
+        this.updateSpellCheckLanguageButton_(languageCode);
       if (cr.isChromeOS)
         this.updateInputMethodList_(languageCode);
       this.updateLanguageListInAddLanguageOverlay_();
     },
 
     /**
      * Handles languageOptionsList's save event.
      * @param {Event} e Save event.
      * @private
      */
@@ skipping 569 matching lines @@
   LanguageOptions.uiLanguageSaved = function() {
     $('language-options-ui-language-button').style.display = 'none';
     $('language-options-ui-notification-bar').style.display = 'block';
   };
 
   // Export
   return {
     LanguageOptions: LanguageOptions
   };
 });