Remove file-level 'use strict' from file_manager.

ui/file_manager/gallery/js/gallery_item.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';
-
 /**
  * Object representing an image item (a photo).
  *
  * @param {FileEntry} entry Image entry.
  * @param {EntryLocation} locationInfo Entry location information.
  * @param {Object} metadata Metadata for the entry.
  * @param {MetadataCache} metadataCache Metadata cache instance.
  * @param {boolean} original Whether the entry is original or edited.
  * @constructor
  */
@@ skipping 332 matching lines @@
         return Promise.reject(str('GALLERY_FILE_EXISTS'));
       }, function() {
         return new Promise(
             this.entry_.moveTo.bind(this.entry_, parentDirectory, newFileName));
       }.bind(this));
     }.bind(this));
   }.bind(this)).then(function(entry) {
     this.entry_ = entry;
   }.bind(this));
 };