[quickview] The controller deleteConfirmDialog_ member is @private

Change its closure tag to @private. Minor: nix an unneeded extra line.

Tbr: alex
Bug: 803259
Change-Id: I8b103f26cfa7c8de1e40216b80be3dc47d6d0026
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2035492Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737966}

ui/file_manager/file_manager/foreground/js/quick_view_controller.js

@@ -66,7 +66,7 @@ class QuickViewController {
 
     /**
      * Delete confirm dialog.
-     * @type {?FilesConfirmDialog}
+     * @private {?FilesConfirmDialog}
      */
     this.deleteConfirmDialog_ = null;
 
@@ -432,7 +432,6 @@ class QuickViewController {
       if (params.hasTask) {
         this.tasks_ = fileTasks;
       }
-
     });
   }