Compile all the UI elements of Files app in gyp v2

ui/file_manager/externs/progress_center_panel.js

Index: ui/file_manager/externs/progress_center_panel.js
diff --git a/ui/file_manager/externs/progress_center_panel.js b/ui/file_manager/externs/progress_center_panel.js
deleted file mode 100644
index ee111059d7a1ba4f5fe315999c1a2d218dc1d255..0000000000000000000000000000000000000000
--- a/ui/file_manager/externs/progress_center_panel.js
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright 2017 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.
-
-/**
- * @constructor
- * @struct
- */
-function ProgressCenterPanel() {}
-
-/**
- * @param {string} id
- */
-ProgressCenterPanel.prototype.dismissErrorItem = function(id) {};
-
-/**
- * @param {!ProgressCenterItem} item
- */
-ProgressCenterPanel.prototype.updateItem = function(item) {};
-
-/** @type {?function(string)} */
-ProgressCenterPanel.prototype.cancelCallback;
-
-/** @type {?function(string)} */
-ProgressCenterPanel.prototype.dismissErrorItemCallback;