Fix: condition to hide generic file handlers has to be inverted.

ui/file_manager/file_manager/foreground/js/file_tasks.js

Index: ui/file_manager/file_manager/foreground/js/file_tasks.js
diff --git a/ui/file_manager/file_manager/foreground/js/file_tasks.js b/ui/file_manager/file_manager/foreground/js/file_tasks.js
index a1c2566fd3f8499471203ca90c16991957136982..1096215199a1d6691d7d238adef44fd5e7bc1e8b 100644
--- a/ui/file_manager/file_manager/foreground/js/file_tasks.js
+++ b/ui/file_manager/file_manager/foreground/js/file_tasks.js
@@ -827,7 +827,7 @@ FileTasks.prototype.createCombobuttonItem_ = function(task, opt_title,
 FileTasks.prototype.showTaskPicker = function(taskDialog, title, message,
                                               onSuccess,
                                               opt_hideGenericFileHandler) {
-  var items = !!opt_hideGenericFileHandler ? this.createItems_() :
+  var items = !opt_hideGenericFileHandler ? this.createItems_() :
       this.createItems_().filter(function(item) {
         return !item.isGenericFileHandler;
       });