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This reverts commit a42b2a30.

Reason for revert: Causing failures on linux-chromeos-dbg and linux-chromeos-chrome - see https://crbug.com/1143173

Original change's description:
> [CrOS PhoneHub] Mark tether ineligible if SIM has no reception.
>
> TetherControllerImpl will now mark the tether feature ineligible if
> it is notified by the PhoneModel that the SIM state has changed to
> anything other than kSimWithReception.
>
> Fixed: 1140812
> Bug: 1106937
> Change-Id: Ia18c5e06c57805541b03b29afea1762e85b8304f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500182
> Commit-Queue: Regan Hsu <hsuregan@chromium.org>
> Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#821493}

TBR=khorimoto@chromium.org,hsuregan@chromium.org

Change-Id: Id0ae4601f07b125f8e1e11b99b2de81ab0344bfd
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1106937, 1143173
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2504857Reviewed-by: Austin Tankiang <austinct@chromium.org>
Commit-Queue: Austin Tankiang <austinct@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821641}