[Files.app] Update the filelist on delete-only filechange event

BUG=392435
TEST=manually tested

Review URL: https://codereview.chromium.org/393303002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283689 0039d316-1c4b-4281-b951-d872f2087c98

ui/file_manager/file_manager/foreground/js/directory_model.js

@@ -183,6 +183,8 @@ DirectoryModel.prototype.onWatcherDirectoryChanged_ = function(event) {
         this.currentDirContents_.prefetchMetadata(entries, true, function() {
           this.rescanSoon(false);
         }.bind(this));
+      } else {
+        this.rescanSoon(false);
       }
     }.bind(this)).catch(function(error) {
       console.error('Error in proceeding the changed event.', error,