Compile file_manager and eliminate gyp v1 from Files App!

ui/file_manager/externs/file_browser_background.js

Index: ui/file_manager/externs/file_browser_background.js
diff --git a/ui/file_manager/externs/file_browser_background.js b/ui/file_manager/externs/file_browser_background.js
deleted file mode 100644
index d2290e36fc1cd2e0da9635978b7a411842eabd32..0000000000000000000000000000000000000000
--- a/ui/file_manager/externs/file_browser_background.js
+++ /dev/null
@@ -1,17 +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.
-
-/**
- * @interface
- * @struct
- */
-var FileBrowserBackground = function() {};
-
-/**
- * @param {function()} callback
- */
-FileBrowserBackground.prototype.ready = function(callback) {};
-
-/** @type {!analytics.Tracker} */
-FileBrowserBackground.prototype.tracker;