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

chrome/browser/resources/file_manager/background/js/volume_manager.js

Index: chrome/browser/resources/file_manager/background/js/volume_manager.js
diff --git a/chrome/browser/resources/file_manager/background/js/volume_manager.js b/chrome/browser/resources/file_manager/background/js/volume_manager.js
index 4c241d5a09dc9ab7da1fa9cc68b6acc4cfed32fb..2d98d6bb1c3f8c59bff09e6b0e448d60e0aff1f2 100644
--- a/chrome/browser/resources/file_manager/background/js/volume_manager.js
+++ b/chrome/browser/resources/file_manager/background/js/volume_manager.js
@@ -486,8 +486,9 @@ VolumeManager.prototype.onMountCompleted_ = function(event) {
     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);