only in patch2:
unchanged:
--- a/core/modules/system/tests/modules/system_module_test/system_module_test.module
+++ b/core/modules/system/tests/modules/system_module_test/system_module_test.module
@@ -14,4 +14,7 @@ function system_module_test_html_head_alter(&$head_elements) {
   unset($head_elements['HandheldFriendly']);
   unset($head_elements['viewport']);
   unset($head_elements['cleartype']);
+
+  // Remove the IEedge tag.
+  unset($head_elements['IEedge']);
 }