Moved Timer tests to the right directory.

runtime/tests/dart/src/TimerCancel1Test.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.
-
-// Test that a timeout handler can cancel another.
-class TimerCancel1Test {
-  static void testOtherCancel() {
-    var canceleeTimer;
-    var cancelerTimer;
-
-    void timeoutHandlerUnreachable(Timer timer) {
-      Expect.fails("A canceled timeout handler should be unreachable.");
-    }
-
-    void cancelHandler(Timer timer) {
-      canceleeTimer.cancel();
-    }
-
-    canceleeTimer = new Timer(timeoutHandlerUnreachable, 1000, false);
-    cancelerTimer = new Timer(cancelHandler, 1, false);
-  }
-
-  static void testMain() {
-    testOtherCancel();
-  }
-}
-
-main() {
-  TimerCancel1Test.testMain();
-}