Fix File Copy Manager Wrapper to work in the strict mode.

chrome/browser/resources/file_manager/js/main_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.
 
@@ skipping 78 matching lines @@
 //<include src="sidebar.js"/>
 //<include src="volume_manager.js"/>
 //<include src="media/media_util.js"/>
 //<include src="metadata/metadata_cache.js"/>
 //<include src="default_action_dialog.js"/>
 //<include src="file_manager_commands.js"/>
 // // For accurate load performance tracking place main.js should be
 // // the last include to include.
 //<include src="main.js"/>
 
+// Exports
+window.FileCopyManagerWrapper = FileCopyManagerWrapper;
+
 })();