Generate tear-off closures dynamically.

dart/tests/lib/lib.status

Index: dart/tests/lib/lib.status
diff --git a/dart/tests/lib/lib.status b/dart/tests/lib/lib.status
index ec3f2b9350f6ae6354e2692c65ad53ab9d298c5a..3727c6fa3c15ac1c86ed5cc25dce67abea853c24 100644
--- a/dart/tests/lib/lib.status
+++ b/dart/tests/lib/lib.status
@@ -58,7 +58,6 @@ mirrors/metadata_allowed_values_test/13: MissingCompileTimeError # Issue 14548
 mirrors/metadata_allowed_values_test/14: MissingCompileTimeError # Issue 14548
 mirrors/method_mirror_name_test: RuntimeError # Issue 6335
 mirrors/method_mirror_properties_test: RuntimeError # Issue 11861
-mirrors/method_mirror_returntype_test : RuntimeError # Issue 11928
 mirrors/method_mirror_source_test : RuntimeError # Issue 6490
 mirrors/mirrors_test: RuntimeError # TODO(ahe): I'm working on fixing this.
 mirrors/mixin_test: RuntimeError # Issue 12464
@@ -130,6 +129,11 @@ async/catch_errors8_test: Fail # Timer interface not supported: dartbug.com/7728
 async/run_zoned8_test: Fail # Timer interface not supported: dartbug.com/7728.
 
 
+[ $compiler == dart2js ]
+convert/chunked_conversion_utf88_test: Slow, Pass
+convert/utf85_test: Slow, Pass
+
+
 [ $compiler == dart2js && $browser ]
 async/timer_not_available_test: Fail, OK # only meant to test when there is no way to
                                          # implement timer (currently only in d8)