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

chrome/browser/chromeos/file_manager/file_tasks.cc

 // 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 "chrome/browser/chromeos/file_manager/file_tasks.h"
 
 #include "apps/launcher.h"
 #include "base/bind.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/stringprintf.h"
@@ skipping 248 matching lines @@
   task->app_id = result[0];
   task->task_type = task_type;
   task->action_id = result[2];
 
   return true;
 }
 
 bool ExecuteFileTask(Profile* profile,
                      const GURL& source_url,
                      const std::string& app_id,
-                     int32 tab_id,
                      const TaskDescriptor& task,
                      const std::vector<FileSystemURL>& file_urls,
                      const FileTaskFinishedCallback& done) {
   if (!FileBrowserHasAccessPermissionForFiles(profile, source_url,
                                               app_id, file_urls))
     return false;
 
   // drive::FileTaskExecutor is responsible to handle drive tasks.
   if (task.task_type == TASK_TYPE_DRIVE_APP) {
     DCHECK_EQ(kDriveAppActionID, task.action_id);
     drive::FileTaskExecutor* executor =
         new drive::FileTaskExecutor(profile, task.app_id);
     executor->Execute(file_urls, done);
     return true;
   }
 
   // Get the extension.
   ExtensionService* service =
       extensions::ExtensionSystem::Get(profile)->extension_service();
   const Extension* extension = service ?
       service->GetExtensionById(task.app_id, false) : NULL;
   if (!extension)
     return false;
 
   // Execute the task.
   if (task.task_type == TASK_TYPE_FILE_BROWSER_HANDLER) {
     return file_browser_handlers::ExecuteFileBrowserHandler(
         profile,
         extension,
-        tab_id,
         task.action_id,
         file_urls,
         done);
   } else if (task.task_type == TASK_TYPE_FILE_HANDLER) {
     for (size_t i = 0; i != file_urls.size(); ++i) {
       apps::LaunchPlatformAppWithFileHandler(
           profile, extension, task.action_id, file_urls[i].path());
     }
 
     if (!done.is_null())
@@ skipping 229 matching lines @@
     if (file_browser_handlers::IsFallbackFileBrowserHandler(
             task->task_descriptor())) {
       task->set_is_default(true);
       return;
     }
   }
 }
 
 }  // namespace file_tasks
 }  // namespace file_manager