Remove cleanup code from 2014 and get rid of one more call to BrowserThread::FILE

R=torne@chromium.org

Bug: 689520
Change-Id: I376c712f7f9514ed2c1b712a0e5df2f897aad138
Reviewed-on: https://chromium-review.googlesource.com/600288
Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#492044}
5 files changed