Remove file-level 'use strict' from file_manager.

ui/file_manager/file_manager/foreground/js/file_manager_commands.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.
 
-'use strict';
-
 /**
  * TODO(dzvorygin): Here we use this hack, since 'hidden' is standard
  * attribute and we can't use it's setter as usual.
  * @param {boolean} value New value of hidden property.
  */
 cr.ui.Command.prototype.setHidden = function(value) {
   this.__lookupSetter__('hidden').call(this, value);
 };
 
 /**
@@ skipping 927 matching lines @@
 /**
  * Open inspector for background page.
  * @type {Command}
  */
 CommandHandler.COMMANDS_['inspect-background'] = /** @type {Command} */ ({
   execute: function(event, fileManager) {
     chrome.fileManagerPrivate.openInspector('background');
   },
   canExecute: CommandUtil.canExecuteAlways
 });