Move FileCopyManager to background page.

chrome/browser/resources/file_manager/js/background_scripts.js

+// 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.
+
+// The include directives are put into Javascript-style comments to prevent
+// parsing errors in non-flattened mode. The flattener still sees them.
+// Note that this makes the flattener to comment out the first line of the
+// included file but that's all right since any javascript file should start
+// with a copyright comment anyway.
+
+// //metrics.js initiates load performance tracking
+// //so we want to parse it as early as possible.
+//<include src="metrics.js"/>
+//
+//<include src="../../shared/js/cr.js"/>
+//<include src="../../shared/js/event_tracker.js"/>
+//<include src="../../shared/js/cr/event_target.js"/>
+//
+//<include src="util.js"/>
+// // Only for static methods.
+// // TODO(olege): Remove once DirectoryModel is refactored.
+//<include src="directory_model.js"/>
+//<include src="file_copy_manager.js"/>
+//
+//<include src="background_main.js"/>