Revert 154613 "Update expectations on failing fast/filesystem/wo..."

The failure has been fixed by r154706 so reverting the expectations.

> Update expectations on failing fast/filesystem/workers/file-writer* tests
> 
> TBR=dimich@chromium.org,kinuko@chromium.org
> BUG=258949
> 
> Review URL: https://codereview.chromium.org/19575007

TBR=kinuko@chromium.org,dimich@chromium.org

Review URL: https://codereview.chromium.org/19593011

git-svn-id: svn://svn.chromium.org/blink/trunk@154826 bbb929c8-8fbe-4397-9dbb-9b2b20218538