Files.app: Fix a jscompiler error.

ui/file_manager/file_manager/background/js/media_import_handler.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.
 
 // Namespace
 var importer = importer || {};
 
 /**
  * Interface providing access to information about active import processes.
  *
@@ skipping 142 matching lines @@
  * @param {Object=} updateInfo
  */
 importer.MediaImportHandler.prototype.onFileImported_ =
     function(task, updateType, updateInfo) {
   if (updateType !==
       importer.MediaImportHandler.ImportTask.UpdateType.ENTRY_CHANGED) {
     return;
   }
   // Update info must exist for ENTRY_CHANGED notifications.
   console.assert(updateInfo && updateInfo.destination);
-  /** @type {!importer.MediaImportHandler.ImportTask.EntryChangedInfo} */
-  var info = updateInfo;
+  var info =
+      /** @type {!importer.MediaImportHandler.ImportTask.EntryChangedInfo} */ (
+          updateInfo);
 
   // Tag the import with a private drive property.
   chrome.fileManagerPrivate.setEntryTag(
       info.destination.toURL(),
       'private',  // Scoped to just this app.
       importer.MediaImportHandler.IMPORTS_TAG_KEY,
       importer.MediaImportHandler.IMPORTS_TAG_VALUE,
       function() {
         if (chrome.runtime.lastError) {
           console.error('Unable to tag imported media: ' +
@@ skipping 352 matching lines @@
             metrics.ImportEvents.FILES_DEDUPLICATED
                 .label(disposition)
                 .value(count));
       }.bind(this));
 
   this.tracker_.send(
       metrics.ImportEvents.FILES_DEDUPLICATED
           .label('all-duplicates')
           .value(totalDeduped));
 };