Migrate from URLs to Entries in the Files App's gallery.

chrome/browser/resources/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.
 
 'use strict';
 
 /**
  * Represents each volume, such as "drive", "download directory", each "USB
  * flush storage", or "mounted zip archive" etc.
  *
@@ skipping 468 matching lines @@
     if (status === util.VolumeError.PATH_UNMOUNTED) {
       console.warn('Volume already unmounted: ', mountPath);
       status = 'success';
     }
     var requestKey = this.makeRequestKey_('unmount', mountPath);
     var requested = requestKey in this.requests_;
     var volumeInfo = this.volumeInfoList.find(mountPath);
     if (event.status === 'success' && !requested && volumeInfo) {
       console.warn('Mounted volume without a request: ', mountPath);
       var e = new Event('externally-unmounted');
+      // TODO(mtomasz): The mountPath field is deprecated. Remove it.
       e.mountPath = mountPath;
-      e.volumeType = volumeInfo.volumeType;
+      e.volumeInfo = volumeInfo;
       this.dispatchEvent(e);
     }
     this.finishRequest_(requestKey, status);
 
     if (event.status === 'success')
       this.volumeInfoList.remove(mountPath);
   }
 };
 
 /**
@@ skipping 205 matching lines @@
       callbacks[i].apply(self, args);
     }
   };
   if (status === 'success') {
     callEach(request.successCallbacks, this, [opt_mountPath]);
   } else {
     volumeManagerUtil.validateError(status);
     callEach(request.errorCallbacks, this, [status]);
   }
 };