Re-enable unittest tests disabled due to issues 10935 and 11473.

pkg/pkg.status

Index: pkg/pkg.status
===================================================================
--- pkg/pkg.status	(revision 25670)
+++ pkg/pkg.status	(working copy)
@@ -22,9 +22,6 @@
 watcher/test/no_subscription_test: Pass, Fail # Issue 12107
 watcher/test/directory_watcher_test: Pass, Fail # Issue 12107
 
-[ $compiler == dart2js && $runtime == ff ]
-unittest/test/unittest_*_test: Pass, Timeout # http://dartbug.com/11473
-
 [ $runtime == d8 || $runtime == jsshell ]
 unittest/test/unittest_nested_groups_setup_teardown_test: Pass, Fail # http://dartbug.com/10109
 stack_trace/test/vm_test: Fail, OK # VM-specific traces
@@ -73,7 +70,6 @@
 unittest/test/mock_stepwise_negative_test: Skip
 
 [ $compiler == dart2js && $csp ]
-unittest/test/unittest_*_test: Pass, Crash # Issue 10935
 observe/test/observe_test: Fail # Issue 11970
 observe/test/path_observer_test: Fail  # Issue 11970
 mdv/test/binding_syntax_test: Fail # Issue 11970