Revert "Let `Isolate.errors` close on isolate exit."

tests/isolate/isolate_errors_test.dart

Index: tests/isolate/isolate_errors_test.dart
diff --git a/tests/isolate/isolate_errors_test.dart b/tests/isolate/isolate_errors_test.dart
deleted file mode 100644
index 31735392a987a3623f027e55a72769374154f675..0000000000000000000000000000000000000000
--- a/tests/isolate/isolate_errors_test.dart
+++ /dev/null
@@ -1,91 +0,0 @@
-// Copyright (c) 2016, 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.
-
-library isolate_errors;
-
-import "dart:isolate";
-import "dart:async";
-import "package:async_helper/async_helper.dart";
-import "package:expect/expect.dart";
-
-isomain(arg) {
-  if (arg is SendPort) {
-    RawReceivePort wait = new RawReceivePort();
-    wait.handler = (message) {
-      wait.close();
-      isomain(message);
-    };
-    arg.send(wait.sendPort);
-  } else {
-    throw new ArgumentError(arg);
-  }
-}
-
-manyErrorsMain(int count) {
-  for (int i = 0; i < count; i++) {
-    Timer.run(() { throw "test#$i"; });
-  }
-}
-
-main(){
-  asyncStart();
-  {
-    asyncStart();
-    Isolate.spawn(isomain, "test-1", paused: true).then((Isolate i) {
-      var errors = [];
-      i.errors.listen(null,
-        onError: (e, s) {
-          errors.add(e.toString().contains("test-1"));
-        },
-        onDone: () {
-          Expect.listEquals([true], errors);
-          asyncEnd();
-        });
-      i.resume(i.pauseCapability);
-    });
-  }
-
-  {
-    asyncStart();
-    var messageReceived = new Completer();
-    var p = new RawReceivePort()..handler = messageReceived.complete;
-    Isolate.spawn(isomain, p.sendPort).then((i) {
-      messageReceived.future.then((port) {
-        p.close();
-        // Isolate has started and is waiting for response.
-        var errors = [];
-        i.errors.listen(null,
-          onError: (e, s) {
-            errors.add(e.toString().contains("test-2"));
-          },
-          onDone: () {
-            Expect.listEquals([true], errors);
-            asyncEnd();
-          });
-        port.send("test-2");
-      });
-    });
-  }
-
-  // {
-  //   asyncStart();
-  //   Isolate.spawn(manyErrorsMain, 5,
-  //                 paused: true, errorsAreFatal: false).then((i) {
-  //     var errors = [];
-  //     i.errors.listen(null,
-  //       onError: (e, s) {
-  //         print(e);
-  //         errors.add(e.toString().contains("test#${errors.length}"));
-  //       },
-  //       onDone: () {
-  //         print("done?");
-  //         Expect.listEquals([true, true, true, true, true], errors);
-  //         asyncEnd();
-  //       });
-  //     i.resume(i.pauseCapability);
-  //   });
-  // }
-
-  asyncEnd();
-}