[dart:io] Namespaces for file IO

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 274 matching lines @@
 # SIMDBC interpreter doesn't support lazy linking of natives.
 link_natives_lazily_test: SkipByDesign
 
 # SIMDBC interpreter doesn't support --no_lazy_dispatchers
 no_lazy_dispatchers_test: SkipByDesign
 
 io/secure_unauthorized_test: Pass, RuntimeError # Issue 28719
 
 [ $system == android ]
 io/process_exit_test: RuntimeError # Issue 29578
-io/platform_resolved_executable_test: RuntimeError # Issue 26376
 io/process_path_test: RuntimeError # Issue 26376
 io/file_test: RuntimeError # Issue 26376
 io/process_path_environment_test: RuntimeError # Issue 26376
 io/file_system_watcher_test: RuntimeError # Issue 26376
 io/resolve_symbolic_links_test: RuntimeError # Issue 26376
 io/file_stat_test: RuntimeError # Issue 26376
 io/raw_datagram_socket_test: RuntimeError # Issue 27638
 io/http_proxy_advanced_test: RuntimeError # Issue 27638
 io/regress_21160_test: RuntimeError # Issue 27638
 io/secure_multiple_client_server_test: RuntimeError # Issue 27638
@@ skipping 160 matching lines @@
 package/scenarios/packages_dir_only/packages_dir_only_test: Fail # Unable to parse package files Flutter Issue 9115
 package/scenarios/both_dir_and_file/prefers_packages_file_test: Fail # Unable to parse package files Flutter Issue 9115
 package/package_test: Fail # Unable to parse package files Flutter Issue 9115
 #unboxed_int_converter_test: Fail # Unable to parse package files Flutter Issue 9115
 io/process_run_output_test: Fail # Unable to parse package files Flutter Issue 9115
 
 io/dependency_graph_test: CompileTimeError # Imports dart:mirrors
 io/skipping_dart2js_compilations_test: CompileTimeError # Uses mirrors
 io/test_harness_analyzer_test: CompileTimeError # Uses mirrors
 io/test_runner_test: CompileTimeError # Uses mirrors