Refactor browser test enqueuing in test scripts.

tests/html/html.status

Index: tests/html/html.status
diff --git a/tests/html/html.status b/tests/html/html.status
index a4d38d6a48b33c4f0b586f948df9dc46d8b4a478..485bb40889e2f99f04d6763f19ce1646818c8b3b 100644
--- a/tests/html/html.status
+++ b/tests/html/html.status
@@ -2,9 +2,6 @@
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
-no_linked_scripts_htmltest: Skip # HTML tests are under development
-scripts_htmltest: Skip # HTML tests are under development
-
 event_test: Skip  # Issue 1996
 interactive_test: Skip # Must be run manually.
 dromaeo_smoke_test: Skip # Issue 14521, 8257
@@ -124,6 +121,8 @@ serialized_script_value_test: Fail
 websocket_test/websocket: Fail # TODO(efortuna): Issue 7875.
 canvasrenderingcontext2d_test/drawImage_video_element: Fail # IE does not support drawImage w/ video element
 canvasrenderingcontext2d_test/drawImage_video_element_dataUrl: Fail # IE does not support drawImage w/ video element
+no_linked_scripts_htmltest: Skip # Times out on IE.  Issue 21537
+scripts_htmltest: Skip # Times out on IE.  Issue 21537
 
 [$runtime == ie10 ]
 # IE10 Feature support statuses-