Update firefox expectations after updating to version 21

tests/html/html.status

 # Copyright (c) 2013, 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.
 
 window_open_test: Skip # http://dartbug.com/5151
 async_window_test: Skip #TODO(gram): investigating
 
 event_test: Skip  # Issue 1996
 custom_elements_test: Skip # Not yet implemented.
 interactive_test: Skip # Must be run manually.
@@ skipping 10 matching lines @@
 dom_isolates_test: Skip # Need to migrate to new spawnDomFunction.
 
 [ $compiler == dart2js && $runtime == ie10 ]
 indexeddb_3_test: Pass, Timeout, Slow # Issue: http://dartbug.com/9437
 indexeddb_4_test: Pass, Timeout, Slow # Issue: http://dartbug.com/9437
 async_test: Pass, Fail # timers test fails on ie10.
 
 [ $compiler == dart2js && ( $runtime == ie9 || $runtime == ie10 ) ]
 worker_api_test: Fail # IE does not support URL.createObjectURL in web workers.
 
-[ $compiler == dart2js && ( $runtime == ff ) ]
-worker_api_test: Fail # Requires Firefox 21.
-
 [ $compiler == dart2js && $runtime == safari ]
 url_test: Fail # Issue 10096
 
 [ $compiler == dart2js && $browser && $checked ]
 postmessage_structured_test/typed_arrays: Fail # Issue 10097
 postmessage_structured_test/primitives: Fail # Issue 10097
 
 # Layout tests are only supported on DRT.
 [ $runtime == ie9 || $runtime == ie10 || $runtime == safari || $runtime == ff || $runtime == chrome || $runtime == opera ]
 *layout_test: Skip
@@ skipping 266 matching lines @@
 [ $runtime == ff ]
 dart_object_local_storage_test: Skip  # sessionStorage NS_ERROR_DOM_NOT_SUPPORTED_ERR
 dromaeo_smoke_test: Pass, Fail # Issue: 8257
 webgl_1_test: Pass, Fail   # Issue 8219
 canvasrenderingcontext2d_test/drawImage_video_element_dataUrl: Fail # Firefox does not like dataUrl videos for drawImage
 
 # FireFox Feature support statuses-
 # All changes should be accompanied by platform support annotation changes.
 audiobuffersourcenode_test/supported: Fail
 audiocontext_test/supported: Fail
-crypto_test/supported: Fail
 css_test/supportsPointConversions: Fail
 document_test/supports_cssCanvasContext: Fail
 element_types_test/supported_content: Fail
 element_types_test/supported_details: Fail
 element_types_test/supported_embed: Fail
 element_types_test/supported_keygen: Fail
 element_types_test/supported_object: Fail
 element_types_test/supported_shadow: Fail
 element_types_test/supported_template: Fail
 element_types_test/supported_track: Fail
@@ skipping 40 matching lines @@
 [ $compiler == dart2js && $csp && ($runtime == drt || $runtime == safari || $runtime == ff || $runtime == chrome) ]
 js_interop_1_test: Skip            # Test cannot run under CSP restrictions (times out).
 js_interop_2_test: Fail, OK        # Test cannot run under CSP restrictions.
 js_interop_3_test: Skip            # Test cannot run under CSP restrictions (times out).
 postmessage_structured_test: Skip  # Test cannot run under CSP restrictions (times out).
 safe_dom_test: Skip                # Test cannot run under CSP restrictions (times out).
 shadow_dom_layout_test: Fail, OK   # Test cannot run under CSP restrictions.
 
 [ $compiler == dartanalyzer ]
 path_observer_test: Fail