Disable standalone/io/raw_server_socket_cancel_test.
Disable standalone/io/raw_server_socket_cancel_test.

It is marked as flaky, has a bug assigned, and times out always, causing
more work for the buildbots.

BUG=dartbug.com/8675
R=kustermann@google.com

Review URL: https://codereview.chromium.org//14856020

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@22687 260f80e4-7a28-3924-810f-c04153c831b5

dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk