Remove old isolate API and update all code in the repository to use

tests/isolate/static_state_test.dart

-// Copyright (c) 2011, 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("StaticStateTest");
-#import("dart:isolate");
-#import('../../lib/unittest/unittest.dart');
-
-class TestIsolate extends Isolate {
-
-  TestIsolate() : super();
-
-  void main() {
-    Expect.equals(null, state);
-    this.port.receive((var message, SendPort replyTo) {
-      String old = state;
-      state = message;
-      replyTo.send(old, null);
-      if (message == "exit") {
-        this.port.close();
-      }
-    });
-  }
-
-  static String state;
-
-}
-
-void main() {
-  test("static state is not shared between isolates", () {
-    Expect.equals(null, TestIsolate.state);
-    TestIsolate.state = "foo";
-    Expect.equals("foo", TestIsolate.state);
-
-    new TestIsolate().spawn().then(expectAsync1((SendPort remote) {
-      remote.call("bar").then(expectAsync1((reply) {
-        Expect.equals("foo", TestIsolate.state);
-        Expect.equals(null, reply);
-
-        TestIsolate.state = "baz";
-        remote.call("exit").then(expectAsync1((reply) {
-          Expect.equals("baz", TestIsolate.state);
-          Expect.equals("bar", reply);
-        }));
-      }));
-    }));
-  });
-}