Revert of Stop updating context menu task items when not changed.

ui/file_manager/file_manager/foreground/js/task_controller.js

Index: ui/file_manager/file_manager/foreground/js/task_controller.js
diff --git a/ui/file_manager/file_manager/foreground/js/task_controller.js b/ui/file_manager/file_manager/foreground/js/task_controller.js
index c7457d171270354a72faff62ed2170f1e8fde74a..8126570201a14582b44a6b63f40207c61487fe51 100644
--- a/ui/file_manager/file_manager/foreground/js/task_controller.js
+++ b/ui/file_manager/file_manager/foreground/js/task_controller.js
@@ -89,11 +89,6 @@
    * @private {Promise<!FileTasks>}
    */
   this.tasks_ = null;
-
-  /**
-   * @private {!Array<!Entry>}
-   */
-  this.lastSelectedEntries_ = [];
 
   ui.taskMenuButton.addEventListener(
       'select', this.onTaskItemClicked_.bind(this));
@@ -272,18 +267,14 @@
   // FileSelectionHandler.EventType.CHANGE
   if (this.dialogType_ === DialogType.FULL_PAGE &&
       (selection.directoryCount > 0 || selection.fileCount > 0)) {
-    // Compare entries while ignoring changes inside directories.
-    if (!util.isSameEntries(this.lastSelectedEntries_, selection.entries)) {
-      // Show disabled items for position calculation of the menu. They will be
-      // overridden in this.updateTasks_().
-      this.updateContextMenuTaskItems_(
-          [TaskController.createTemporaryDisabledTaskItem_()]);
-    }
+    // Show disabled items for position calculation of the menu. They will be
+    // overridden in this.updateFileSelectionAsync().
+    this.updateContextMenuTaskItems_(
+        [TaskController.createTemporaryDisabledTaskItem_()]);
   } else {
     // Update context menu.
     this.updateContextMenuTaskItems_([]);
   }
-  this.lastSelectedEntries_ = selection.entries;
 };
 
 /**