Remove view controllers dependency of settings tests

Bug: 750372
Change-Id: I50e8fa524ef65adc3bedf88c1eaa0ad59d784d16
Reviewed-on: https://chromium-review.googlesource.com/642113
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Mike Baxley <baxley@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Menglu Huang <huangml@chromium.org>
Cr-Commit-Position: refs/heads/master@{#500037}