Make sure breakpoints are enabled
Make sure breakpoints are enabled

With my previous checkin it became possible that internal
code breakpoints became disabled. Now make sure that when
one of these breakpoints is re-used, it becomes enabled.
Review URL: https://chromiumcodereview.appspot.com//10690053

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@9265 260f80e4-7a28-3924-810f-c04153c831b5

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