ticket:7468 Remove development branch.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/andy@33458 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10051 Create development branch for Mutex experiments.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/andy@33459 251d0590-4201-4cf1-90de-194747b24ca1