Clean up dart:io exceptions.

tests/standalone/io/socket_test.dart

Index: tests/standalone/io/socket_test.dart
diff --git a/tests/standalone/io/socket_test.dart b/tests/standalone/io/socket_test.dart
index e9f2077990cd6c7e8e385bb153f36ce52348cfc0..32e77425d5c26d8b287167ea23951d881983d4dc 100644
--- a/tests/standalone/io/socket_test.dart
+++ b/tests/standalone/io/socket_test.dart
@@ -35,7 +35,7 @@ void testInvalidBind() {
   ServerSocket.bind("ko.faar.__hest__", 0)
       .then((_) { Expect.fail("Failure expected"); } )
       .catchError((error) {
-        Expect.isTrue(error is SocketIOException);
+        Expect.isTrue(error is SocketException);
         port.toSendPort().send(1);
       });
 
@@ -43,7 +43,7 @@ void testInvalidBind() {
   ServerSocket.bind("8.8.8.8", 0)
       .then((_) { Expect.fail("Failure expected"); } )
       .catchError((error) {
-        Expect.isTrue(error is SocketIOException);
+        Expect.isTrue(error is SocketException);
         port.toSendPort().send(1);
       });
 
@@ -61,7 +61,7 @@ void testInvalidBind() {
             })
             .catchError((error) {
               Expect.notEquals('windows', Platform.operatingSystem);
-              Expect.isTrue(error is SocketIOException);
+              Expect.isTrue(error is SocketException);
               port.toSendPort().send(1);
             });
       });