Compile several targets in Gallery in gyp v2.

ui/file_manager/gallery/js/gallery_data_model.js

 // Copyright 2015 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.
 
 /**
  * Data model for gallery.
  *
  * @param {!MetadataModel} metadataModel
  * @param {!EntryListWatcher=} opt_watcher Entry list watcher.
  * @constructor
@@ skipping 66 matching lines @@
           // Dispatch an event.
           var event = new Event('content');
           event.item = item;
           event.oldEntry = oldEntry;
           event.thumbnailChanged = true;
           this.dispatchEvent(event);
 
           if (!util.isSameEntry(oldEntry, item.getEntry())) {
             Promise.all([
               this.metadataModel_.get(
-                  [oldEntry], Gallery.PREFETCH_PROPERTY_NAMES),
+                  [oldEntry], GalleryItem.PREFETCH_PROPERTY_NAMES),
               new ThumbnailModel(this.metadataModel_).get([oldEntry])
             ]).then(function(itemLists) {
               // New entry is added and the item now tracks it.
               // Add another item for the old entry.
               var anotherItem = new GalleryItem(
                   oldEntry,
                   oldLocationInfo,
                   itemLists[0][0],
                   itemLists[1][0],
                   oldIsOriginal);
@@ skipping 44 matching lines @@
  * @private
  */
 GalleryDataModel.prototype.onSplice_ = function(event) {
   if (!event.removed || !event.removed.length)
     return;
   var removedURLs = event.removed.map(function(item) {
     return item.getEntry().toURL();
   });
   this.metadataModel_.notifyEntriesRemoved(removedURLs);
 };