[Sheriff] Mark new regression test as flaky.

BUG=336820
LOG=n
R=bmeurer@chromium.org
TBR=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/139923007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18990 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Prepare push to trunk.  Now working on version 3.24.29.

R=jkummerow@chromium.org
TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/138843008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18991 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'