Remove file-level 'use strict' from file_manager.

ui/file_manager/gallery/js/image_editor/image_editor.js

 // Copyright 2014 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';
-
 /**
  * ImageEditor is the top level object that holds together and connects
  * everything needed for image editing.
  *
  * @param {Viewport} viewport The viewport.
  * @param {ImageView} imageView The ImageView containing the images to edit.
  * @param {ImageEditor.Prompt} prompt Prompt instance.
  * @param {Object} DOMContainers Various DOM containers required for the editor.
  * @param {Array.<ImageEditor.Mode>} modes Available editor modes.
  * @param {function(string, ...[string])} displayStringFunction String
@@ skipping 1181 matching lines @@
 
 /**
  * Hide the prompt.
  */
 ImageEditor.Prompt.prototype.hide = function() {
   if (!this.prompt_) return;
   this.prompt_.setAttribute('state', 'fadeout');
   // Allow some time for the animation to play out.
   this.setTimer(this.reset.bind(this), 500);
 };