Make dart:io unit-tests pass the analyzer.

tests/standalone/standalone.status

Index: tests/standalone/standalone.status
diff --git a/tests/standalone/standalone.status b/tests/standalone/standalone.status
index 7bf4ccf4531a14ecc2de63b5d70f2ee4d58558ea..02d4a167415899d988b2cf8ce19967708fab98cd 100644
--- a/tests/standalone/standalone.status
+++ b/tests/standalone/standalone.status
@@ -56,43 +56,16 @@ vmservice/*: Skip # Do not run standalone vm service tests in browser.
 issue14236_test: Skip # Issue 14236 Script snapshots do not work in the browser.
 
 
-[ $compiler == dartanalyzer ]
+[ $compiler == dartanalyzer || $compiler == dart2analyzer ]
 javascript_int_overflow_literal_test/01: fail, ok
 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
 
-# The dart:io library is created at build time from separate files, and
-# there is no language-spec compatible way to run unit tests on the private
-# members and methods of dart:io.
-# Dart analyzer spots the misuse of 'part' directives in these unit tests.
-io/http_headers_test: Skip
-io/http_cookie_date_test: Skip
-io/http_parser_test: Skip
-io/web_socket_protocol_processor_test: Skip
-
 # This is runtime test.
 io/process_exit_negative_test: Skip
 
-[ $compiler == dart2analyzer ]
-javascript_int_overflow_literal_test/01: fail, ok
-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
-
-# The dart:io library is created at build time from separate files, and
-# there is no language-spec compatible way to run unit tests on the private
-# members and methods of dart:io.
-# Dart analyzer spots the misuse of 'part' directives in these unit tests.
-io/http_headers_test: Skip
-io/http_cookie_date_test: Skip
-io/http_parser_test: Skip
-io/web_socket_protocol_processor_test: Skip
-
-# This is runtime test.
-io/process_exit_negative_test: Skip
 
 [ $compiler == dart2js ]
 number_identity_test: Skip # Bigints and int/double diff. not supported.