Disable unified consent for sync_settings_table_view_controller unit tests.

SyncSettingsTableViewController is only used pre-Unified Consent and
DCHECKs that Unified Consent is disabled. This CL ensures that
SyncSettingsTableViewControllerTest runs with Unified Consent disable.

This is a pre-requisite for enabling Unified Consent by default on iOS.

Bug: 960260
Change-Id: I0499985052763eeac1fb640701b341ccdcdfc949
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611605
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659482}
3 files changed