Use app list item shadow for app list folders.

ui/app_list/test/app_list_test_model.cc

Index: ui/app_list/test/app_list_test_model.cc
diff --git a/ui/app_list/test/app_list_test_model.cc b/ui/app_list/test/app_list_test_model.cc
index 8ab31d473e72ce1f4329ee72c83632e814cd766f..e263b0f99a5013d234920a6d752c3250b77e6a56 100644
--- a/ui/app_list/test/app_list_test_model.cc
+++ b/ui/app_list/test/app_list_test_model.cc
@@ -30,8 +30,7 @@ AppListTestModel::AppListTestItem::AppListTestItem(
     AppListTestModel* model)
     : AppListItem(id),
       model_(model) {
-  SetIcon(CreateImageSkia(kGridIconDimension, kGridIconDimension),
-          false /* has_shadow */);
+  SetIcon(CreateImageSkia(kGridIconDimension, kGridIconDimension));
 }
 
 AppListTestModel::AppListTestItem::~AppListTestItem() {