[io] Remove assertion for socket timeout exception contents.

Change-Id: I91648caa2d5e53013a1f53412ec5478f5bf4b719
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/413326
Commit-Queue: Brian Quinlan <[email protected]>
Reviewed-by: Alexander Aprelev <[email protected]>

Author: brianquinlan

tests/standalone/io/secure_socket_test.dart

@@ -98,14 +98,15 @@ Future test(String certType, String password) {
 void testConnectTimeout() {
   asyncStart();
   Duration timeout = new Duration(milliseconds: 0);
+  // TODO(https://github.com/dart-lang/sdk/issues/60246): ensure that the
+  // exception was really caused by a timeout.
   SecureSocket.connect("8.8.8.7", 80, timeout: timeout)
       .then((socket) {
         Expect.fail("Unexpected connection made.");
         asyncEnd();
       })
       .catchError((e) {
         Expect.isTrue(e is SocketException);
-        Expect.equals(Platform.isWindows? 10060 : 110, (e as SocketException).osError?.errorCode);
         asyncEnd();
       });
 }

tests/standalone/io/socket_connect_timeout_test.dart

@@ -16,17 +16,15 @@ import "package:expect/expect.dart";
 void main() {
   asyncStart();
   Duration timeout = new Duration(milliseconds: 0);
+  // TODO(https://github.com/dart-lang/sdk/issues/60246): ensure that the
+  // exception was really caused by a timeout.
   Socket.connect("8.8.8.7", 80, timeout: timeout)
       .then((socket) {
         Expect.fail("Unexpected connection made.");
         asyncEnd();
       })
       .catchError((e) {
         Expect.isTrue(e is SocketException);
-        Expect.equals(
-          Platform.isWindows ? 10060 : 110,
-          (e as SocketException).osError?.errorCode,
-        );
         asyncEnd();
       });
 }