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

chrome/browser/chromeos/extensions/file_manager/private_api_tasks.cc

Index: chrome/browser/chromeos/extensions/file_manager/private_api_tasks.cc
diff --git a/chrome/browser/chromeos/extensions/file_manager/private_api_tasks.cc b/chrome/browser/chromeos/extensions/file_manager/private_api_tasks.cc
index cecd07fb55f196f732b46e8fb3c10ace6a1c09b0..fa4573077533334e181a5089ab5ee919691517d8 100644
--- a/chrome/browser/chromeos/extensions/file_manager/private_api_tasks.cc
+++ b/chrome/browser/chromeos/extensions/file_manager/private_api_tasks.cc
@@ -89,12 +89,10 @@ bool FileBrowserPrivateExecuteTaskFunction::RunImpl() {
     file_urls.push_back(url);
   }
 
-  const int32 tab_id = file_manager::util::GetTabId(dispatcher());
   return file_manager::file_tasks::ExecuteFileTask(
       GetProfile(),
       source_url(),
       extension_->id(),
-      tab_id,
       task,
       file_urls,
       base::Bind(&FileBrowserPrivateExecuteTaskFunction::OnTaskExecuted, this));