Fix bot breakage :  - remove line in lib.status file for mirrors/mirrors_reader_test to account for https://codereview.chromium.org//133813008
Fix bot breakage :
 - remove line in lib.status file for mirrors/mirrors_reader_test to
account for https://codereview.chromium.org//133813008

Review URL: https://codereview.chromium.org//147543005

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@32464 260f80e4-7a28-3924-810f-c04153c831b5

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