[Sheriff] Mark new regression test flaky on linux 32.
[Sheriff] Mark new regression test flaky on linux 32.

BUG=
TBR=jarin@chromium.org

Review URL: https://codereview.chromium.org/148483004

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@19000 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh