Files app: keep focus on Delete button after confirmation dialog closure

Bug: 1054319

Change-Id: I42e0444600ce27cf9cf6068b6ee690e1e69d8099
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134748
Commit-Queue: Alex Danilo <adanilo@chromium.org>
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756152}

ui/file_manager/file_manager/foreground/js/toolbar_controller.js

@@ -261,7 +261,6 @@ class ToolbarController {
    * @private
    */
   onDeleteButtonClicked_() {
-    this.deleteButton_.blur();
     this.deleteCommand_.canExecuteChange(this.listContainer_.currentList);
     this.deleteCommand_.execute(this.listContainer_.currentList);
   }