Have rebaseline-o-matic sync again after upload.

On long rebaselines, TestExpectations changes between the time the rebaseline
was started and the time it finished uploading. So, the dcommit is failing
with a conflict.

NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/19620004

git-svn-id: svn://svn.chromium.org/blink/trunk@154842 bbb929c8-8fbe-4397-9dbb-9b2b20218538