Turn on verbose flag for compiling file_manager.

ui/file_manager/file_manager/foreground/js/directory_contents.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.
 
 /**
  * Scanner of the entries.
  * @constructor
  */
 function ContentScanner() {
   this.cancelled_ = false;
@@ skipping 483 matching lines @@
  */
 FileListModel.prototype.splice = function(index, deleteCount, var_args) {
   for (var i = index; i < index + deleteCount; i++) {
     if (i >= 0 && i < this.length)
       this.onRemoveEntryFromList_(/** @type {!Entry} */ (this.item(i)));
   }
   for (var i = 2; i < arguments.length; i++) {
     this.onAddEntryToList_(arguments[i]);
   }
 
-  cr.ui.ArrayDataModel.prototype.splice.apply(this, arguments);
+  return cr.ui.ArrayDataModel.prototype.splice.apply(this, arguments);
 };
 
 /**
  * @override
  */
 FileListModel.prototype.replaceItem = function(oldItem, newItem) {
   this.onRemoveEntryFromList_(oldItem);
   this.onAddEntryToList_(newItem);
 
   cr.ui.ArrayDataModel.prototype.replaceItem.apply(this, arguments);
@@ skipping 664 matching lines @@
 DirectoryContents.createForDriveMetadataSearch = function(
     context, fakeDirectoryEntry, searchType) {
   return new DirectoryContents(
       context,
       true,  // Search
       fakeDirectoryEntry,
       function() {
         return new DriveMetadataSearchContentScanner(searchType);
       });
 };