Files.app: Fix closure compiler error.

ui/file_manager/file_manager/background/js/volume_manager.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.
 
 /**
  * Represents each volume, such as "drive", "download directory", each "USB
  * flush storage", or "mounted zip archive" etc.
  *
  * @constructor
  * @struct
@@ skipping 337 matching lines @@
    * Holds VolumeInfo instances.
    * @type {cr.ui.ArrayDataModel}
    * @private
    */
   this.model_ = new cr.ui.ArrayDataModel([]);
   this.model_.setCompareFunction(field,
                                  /** @type {function(*, *): number} */
                                  (volumeManagerUtil.compareVolumeInfo_));
   this.model_.sort(field, 'asc');
 
-  /** @private {!Object.<string, !importer.Resolver.<!VolumeInfo>>} */
-  this.volumeInfoResolvers_ = {};
-
   Object.freeze(this);
 }
 
 VolumeInfoList.prototype = {
   get length() { return this.model_.length; }
 };
 
 /**
  * Adds the event listener to listen the change of volume info.
  * @param {string} type The name of the event.
@@ skipping 16 matching lines @@
  * Adds the volumeInfo to the appropriate position. If there already exists,
  * just replaces it.
  * @param {VolumeInfo} volumeInfo The information of the new volume.
  */
 VolumeInfoList.prototype.add = function(volumeInfo) {
   var index = this.findIndex(volumeInfo.volumeId);
   if (index !== -1)
     this.model_.splice(index, 1, volumeInfo);
   else
     this.model_.push(volumeInfo);
-
-  // Some folks might be expecting this volume to be initialized soon.
-  // In that case there'll be a resolver function (associated with a promise)
-  // waiting for us here.
-  var resolver = this.volumeInfoResolvers_[volumeInfo.volumeId];
-  if (resolver) {
-    resolver.resolve(volumeInfo);
-  }
 };
 
 /**
  * Removes the VolumeInfo having the given ID.
  * @param {string} volumeId ID of the volume.
  */
 VolumeInfoList.prototype.remove = function(volumeId) {
   var index = this.findIndex(volumeId);
   if (index !== -1)
     this.model_.splice(index, 1);
-
-  // Remove any associated resolvers.
-  delete this.volumeInfoResolvers_[volumeId];
 };
 
 /**
  * Obtains an index from the volume ID.
  * @param {string} volumeId Volume ID.
  * @return {number} Index of the volume.
  */
 VolumeInfoList.prototype.findIndex = function(volumeId) {
   for (var i = 0; i < this.model_.length; i++) {
     if (this.model_.item(i).volumeId === volumeId)
@@ skipping 56 matching lines @@
 
 /**
  * Returns a promise that will be resolved when volume info, identified
  * by {@code volumeId} is created.
  *
  * @param {string} volumeId
  * @return {!Promise.<!VolumeInfo>} The VolumeInfo. Will not resolve
  *     if the volume is never mounted.
  */
 VolumeInfoList.prototype.whenVolumeInfoReady = function(volumeId) {
-  var info = this.findByVolumeId_(volumeId);
-  if (!!info) {
-    return Promise.resolve(info);
-  }
-
-  var resolver = this.volumeInfoResolvers_[volumeId];
-  if (!resolver) {
-    resolver = new importer.Resolver();
-    this.volumeInfoResolvers_[volumeId] = resolver;
-  }
-
-  return resolver.promise;
+  return new Promise(function(fulfill) {
+    var handler = function() {
+      var info = this.findByVolumeId_(volumeId);
+      if (info) {
+        fulfill(info);
+        this.model_.removeEventListener('splice', handler);
+      }
+    }.bind(this);
+    this.model_.addEventListener('splice', handler);
+    handler();
+  }.bind(this));
 };
 
 /**
  * @param {number} index The index of the volume in the list.
  * @return {!VolumeInfo} The VolumeInfo instance.
  */
 VolumeInfoList.prototype.item = function(index) {
   return /** @type {!VolumeInfo} */ (this.model_.item(index));
 };
 
@@ skipping 527 matching lines @@
       this.isDriveBased;
 
   /**
    * Whether the entry is read only or not.
    * @type {boolean}
    */
   this.isReadOnly = isReadOnly;
 
   Object.freeze(this);
 }