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This is a reland of a42b2a30.

phone_model_test_util's CreateFakePhoneStatusModel() returned
unexpected mobile status, resulting in failing tests. Created
TetherControllerImplTest's own CreateFakePhoneStatusModel() to fix.

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}

Fixed: 1140812
Fixed: 1143173
Bug: 1106937
Change-Id: I310daa1d1feea6a74485ddd143608b216414f3bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2507632
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822892}