Turn on verbose flag for compiling file_manager.

ui/file_manager/gallery/js/ribbon.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.
 
 /**
  * Scrollable thumbnail ribbon at the bottom of the Gallery in the Slide mode.
  *
  * @param {!Document} document Document.
  * @param {!Window} targetWindow A window which this ribbon is attached to.
  * @param {!cr.ui.ArrayDataModel} dataModel Data model.
@@ skipping 396 matching lines @@
 };
 
 /**
  * Create a DOM element for a thumbnail.
  *
  * @param {number} index Item index.
  * @return {!Element} Newly created element.
  * @private
  */
 Ribbon.prototype.renderThumbnail_ = function(index) {
-  var item = assertInstanceof(this.dataModel_.item(index), Gallery.Item);
+  var item = assertInstanceof(this.dataModel_.item(index), GalleryItem);
   var url = item.getEntry().toURL();
 
   var cached = this.renderCache_[url];
   if (cached) {
     var img = cached.querySelector('img');
     if (img)
       img.classList.add('cached');
     return cached;
   }
 
@@ skipping 17 matching lines @@
   // Never evict the thumbnails that are currently in the DOM because we rely
   // on this cache to find them by URL.
   this.renderCache_[url] = thumbnail;
   return thumbnail;
 };
 
 /**
  * Set the thumbnail image.
  *
  * @param {!Element} thumbnail Thumbnail element.
- * @param {!Gallery.Item} item Gallery item.
+ * @param {!GalleryItem} item Gallery item.
  * @private
  */
 Ribbon.prototype.setThumbnailImage_ = function(thumbnail, item) {
   thumbnail.setAttribute('title', item.getFileName());
 
   if (!item.getThumbnailMetadataItem())
     return;
 
   this.thumbnailModel_.get([item.getEntry()]).then(function(metadataList) {
     var loader = new ThumbnailLoader(
@@ skipping 38 matching lines @@
  * @param {string} oldUrl Old url.
  * @param {string} newUrl New url.
  * @private
  */
 Ribbon.prototype.remapCache_ = function(oldUrl, newUrl) {
   if (oldUrl != newUrl && (oldUrl in this.renderCache_)) {
     this.renderCache_[newUrl] = this.renderCache_[oldUrl];
     delete this.renderCache_[oldUrl];
   }
 };