Mark pkg/stack_trace/test/trace_test as failing on Safari.

dart/pkg/pkg.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # 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.
 
 # Don't run any test-like files that show up in packages directories. It
 # shouldn't be necessary to run "pub install" in these packages, but if you do
 # it shouldn't break the tests.
 */packages/*/*: Skip
 */*/packages/*/*: Skip
 */*/*/packages/*/*: Skip
@@ skipping 34 matching lines @@
 intl/test/date_time_format_http_request_test: Fail # Issue 8983
 mime/test/mime_multipart_transformer_test: Skip # No typed_data on IE9.
 
 [ $runtime == chrome && $compiler == dart2js ]
 intl/test/date_time_format_http_request_test: Pass, Fail # Issue: 12376
 
 [ $runtime == safari ]
 fixnum/test/int_64_test: Pass, Fail # Bug in JSC.
 crypto/test/hmac_sha1_test: Fail # Issue 11407.
 crypto/test/sha1_test: Fail # Issue 11407.
+stack_trace/test/trace_test: Fail # http://dartbug.com/12380
 
 # Skip browser-specific tests on VM
 [ $runtime == vm ]
 path/test/browser_test: Fail, OK # Uses dart:html
 intl/test/find_default_locale_browser_test: Skip
 intl/test/date_time_format_http_request_test: Skip
 
 [ $runtime == vm && $system == windows ]
 docgen/test/single_library_test: Fail # Issue 11985
 intl/test/find_default_locale_standalone_test: Fail # Issue 8110
@@ skipping 114 matching lines @@
 serialization/test/no_library_test: Skip # Expected Failure
 
 # Skip tests on the VM if the package depends on dart:html
 [ $runtime == vm ]
 custom_element: Skip
 mdv: Skip
 mutation_observer: Skip
 
 [ $runtime == safari || $runtime == chrome || $runtime == ie9 || $runtime == ff || $runtime == dartium || $runtime == drt ]
 docgen/test/single_library_test: Skip # Uses dart:io