Skip pkg/analysis_server/tool/spec/check_all_test on browsers.

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 281 matching lines @@
 polymer/e2e_test/bad_import1: RuntimeError # Issue 17596
 polymer/e2e_test/bad_import2: RuntimeError # Issue 17596
 polymer/e2e_test/bad_import3: Fail, OK # tests broken import
 polymer/test/mirror_loader_test: Skip # tests development only behavior
 
 [ $compiler == dart2js && $runtime == chromeOnAndroid ]
 intl/test/date_time_format_http_request_test: Fail # TODO(kasperl): Please triage.
 
 [ $browser ]
 analysis_server/test/*: Skip # Uses dart:io.
+analysis_server/tool/spec/check_all_test: Skip # Uses dart:io.
 analysis_services/test/*: Skip # Uses dart:io.
 analyzer/test/*: Skip # Uses dart:io.
 barback/test/*: Fail, OK # Uses dart:io.
 code_transformers/test/*: Skip # Uses dart:io.
 http/test/io/*: Fail, OK # Uses dart:io.
 http_parser/test/web_socket_test: Fail, OK # Uses dart:io
 http_multi_server/test/http_multi_server_test: Skip # Uses dart:io
 http_server/test/*: Fail, OK # Uses dart:io.
 http_base/test/http_base_io_test: SkipByDesign # Uses dart:io.
 intl/test/date_time_format_file_even_test: Fail, OK # Uses dart:io.
@@ skipping 149 matching lines @@
 oauth2/test/authorization_code_grant_test: Fail
 oauth2/test/client_test: Fail
 oauth2/test/credentials_test: Fail
 oauth2/test/handle_access_token_response_test: Fail
 
 [ $runtime == drt ]
 http/test/html/client_test: Skip # Issue 18566
 
 [ $system == windows ]
 analysis_server/test/integration/search/get_type_hierarchy_test: Pass, Fail # Issue 20436