Disable folder UI when app sync is disabled

ui/app_list/views/folder_header_view_unittest.cc

Index: ui/app_list/views/folder_header_view_unittest.cc
diff --git a/ui/app_list/views/folder_header_view_unittest.cc b/ui/app_list/views/folder_header_view_unittest.cc
index 14e162fe9ff0eecf5d1806b0ec3900f1026a5086..34f1984c6af5674a54f98cec2d203a78d3a735e1 100644
--- a/ui/app_list/views/folder_header_view_unittest.cc
+++ b/ui/app_list/views/folder_header_view_unittest.cc
@@ -60,6 +60,7 @@ class FolderHeaderViewTest : public views::ViewsTestBase {
   virtual void SetUp() OVERRIDE {
     views::ViewsTestBase::SetUp();
     model_.reset(new AppListTestModel);
+    model_->SetFoldersEnabled(true);
 
     delegate_.reset(new TestFolderHeaderViewDelegate);
     folder_header_view_.reset(new FolderHeaderView(delegate_.get()));