Fix HandleJavaScriptDialog.

chrome/browser/ui/javascript_dialogs/javascript_dialog_cocoa.h

 // Copyright 2016 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.
 
 #ifndef CHROME_BROWSER_UI_JAVASCRIPT_DIALOGS_JAVASCRIPT_DIALOG_COCOA_H_
 #define CHROME_BROWSER_UI_JAVASCRIPT_DIALOGS_JAVASCRIPT_DIALOG_COCOA_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 14 matching lines @@
       content::WebContents* alerting_web_contents,
       const base::string16& title,
       content::JavaScriptDialogType dialog_type,
       const base::string16& message_text,
       const base::string16& default_prompt_text,
       const content::JavaScriptDialogManager::DialogClosedCallback&
           dialog_callback);
 
   // JavaScriptDialog:
   void CloseDialogWithoutCallback() override;
+  base::string16 GetUserInput() override;
 
  private:
   JavaScriptDialogCocoa(
       content::WebContents* parent_web_contents,
       content::WebContents* alerting_web_contents,
       const base::string16& title,
       content::JavaScriptDialogType dialog_type,
       const base::string16& message_text,
       const base::string16& default_prompt_text,
       const content::JavaScriptDialogManager::DialogClosedCallback&
           dialog_callback);
 
   std::unique_ptr<JavaScriptDialogCocoaImpl> impl_;
 
   base::WeakPtrFactory<JavaScriptDialogCocoa> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(JavaScriptDialogCocoa);
 };
 
 #endif  // CHROME_BROWSER_UI_JAVASCRIPT_DIALOGS_JAVASCRIPT_DIALOG_COCOA_H_