[Gardening] Mark two standalone/io/http tests as flaky on dart2analyzer

tests/standalone/standalone.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.
 
 # WARNING:
 # Tests using the multitest feature where failure is expected should *also* be
 # listed in tests/lib/analyzer/analyze_tests.status without the "standalone"
 # prefix.
 
 io/raw_socket_test: Pass, RuntimeError # Issue 28288
@@ skipping 79 matching lines @@
 
 [ $compiler == dartanalyzer || $compiler == dart2analyzer ]
 issue14236_test: Skip # Analyzer can't handle Script snapshots.
 
 # test issue https://code.google.com/p/dart/issues/detail?id=11518
 io/file_constructor_test: fail
 
 # This is runtime test.
 io/process_exit_negative_test: Skip
 
+io/http_parser_test: Pass, CompileTimeError # Issue 28843
+io/http_headers_test: Pass, CompileTimeError # Issue 28843
+
 [ $compiler == dart2analyzer && $builder_tag == strong ]
 *: Skip # Issue 28649
 
 [ $compiler == dart2js ]
 number_identity_test: Skip # Bigints and int/double diff. not supported.
 typed_data_test: Skip # dart:typed_data support needed.
 bytedata_test: Skip # dart:typed_data support needed.
 typed_data_view_test: Skip # dart:typed_data support needed.
 typed_data_isolate_test: Skip # dart:typed_data support needed.
 typed_array_int64_uint64_test: Skip # dart:typed_data on dart2js does not support 64-bit ints.
@@ skipping 298 matching lines @@
 io/socket_source_address_test: SkipByDesign
 io/socket_bind_test: SkipByDesign
 io/http_proxy_advanced_test: SkipByDesign
 io/http_ipv6_test: SkipByDesign
 io/socket_ipv6_test: SkipByDesign
 io/socket_info_ipv6_test: SkipByDesign
 
 [ $builder_tag == asan && $arch == x64 ]
 io/process_detached_test: Pass, Slow
 io/named_pipe_script_test: RuntimeError