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Now ModelTypeController:Stop uses preferences to determine if data type
will be disable completely.
This CL introduce adds metadata_fate parameter which will be used
as signal for clearing metadata.

This is second CL in sequence.

Bug: 823721
Change-Id: Idfe4a70864e2f05aba9fc1ede3b0ccc2a108287a
Reviewed-on: https://chromium-review.googlesource.com/1093318
Commit-Queue: Aleksei Loshkarev <lixan@yandex-team.ru>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567913}