Remove use of BrowserThead::FILE from ChromeBrowsingDataRemoverDelegate.

Bug: 689520
Change-Id: I86aa83083a4e2382435e68bbb422b9056c3be887
Reviewed-on: https://chromium-review.googlesource.com/601267
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#492351}
1 file changed