Stop setting invalid value to the |tab_id| field of fileBrowserHandler API.

chrome/browser/chromeos/file_manager/file_browser_handlers.h

 // 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.
 //
 // This file provides utility functions for file browser handlers.
 // https://developer.chrome.com/extensions/fileBrowserHandler.html
 
 #ifndef CHROME_BROWSER_CHROMEOS_FILE_MANAGER_FILE_BROWSER_HANDLERS_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_MANAGER_FILE_BROWSER_HANDLERS_H_
 
@@ skipping 38 matching lines @@
     Profile* profile,
     const std::vector<GURL>& file_list);
 
 // Executes a file browser handler specified by |extension| of the given
 // action ID for |file_urls|. Returns false if undeclared handlers are
 // found. |done| is on completion. See also the comment at ExecuteFileTask()
 // for other parameters.
 bool ExecuteFileBrowserHandler(
     Profile* profile,
     const extensions::Extension* extension,
-    int32 tab_id,
     const std::string& action_id,
     const std::vector<fileapi::FileSystemURL>& file_urls,
     const file_tasks::FileTaskFinishedCallback& done);
 
 }  // namespace file_browser_handlers
 }  // namespace file_manager
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_MANAGER_FILE_BROWSER_HANDLERS_H_