add 'langauge settings' link to the translate bubble advanced view

chrome/browser/ui/cocoa/translate/translate_bubble_controller.h

 // 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.
 
 #import <Cocoa/Cocoa.h>
 
 #include <memory>
 
 #include "base/mac/scoped_nsobject.h"
 #include "chrome/browser/translate/chrome_translate_client.h"
@@ skipping 22 matching lines @@
   // The views of each state. The keys are TranslateBubbleModel::ViewState,
   // and the values are NSView*.
   base::scoped_nsobject<NSDictionary> views_;
 
   // The 'Done' or 'Translate' button on the advanced (option) panel.
   NSButton* advancedDoneButton_;
 
   // The 'Cancel' button on the advanced (option) panel.
   NSButton* advancedCancelButton_;
 
+  // The 'Language Settings' link on the advanced (option) panel.
+  NSButton* advancedLanguageSettingsLinkButton_;
+
   // The 'Always translate' checkbox on the advanced (option) panel.
   // This is nil when the current WebContents is in an incognito window.
   NSButton* alwaysTranslateCheckbox_;
 
   // The combobox model which is used to deny translation at the view before
   // translate.
   std::unique_ptr<TranslateDenialComboboxModel> translateDenialComboboxModel_;
 
   // The combobox model for source languages on the advanced (option) panel.
   std::unique_ptr<LanguageComboboxModel> sourceLanguageComboboxModel_;
@@ skipping 15 matching lines @@
 - (void)switchToErrorView:(translate::TranslateErrors::Type)errorType;
 
 @end
 
 // The methods on this category are used internally by the controller and are
 // only exposed for testing purposes. DO NOT USE OTHERWISE.
 @interface TranslateBubbleController (ExposedForTesting)
 - (void)handleTranslateButtonPressed;
 - (void)handleDenialPopUpButtonNopeSelected;
 @end