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This reverts commit 1c6c9d1b.

Reason for revert: Breaks tests when combined with https://chromium-review.googlesource.com/c/chromium/src/+/1260491. Doesn't properly wait for devicesync service to be ready before querying the list of devices.

Original change's description:
> Make Instant Tethering work with legacy hosts before hosts update.
> 
> The phone side flags and enrollment will be slower than the ChromeOS
> rollout. In order to avoid breaking Instant Tethering in the meantime,
> look for cases where:
> 
> 1) There are no host devices reporting BETTER_TOGETHER_HOST support.
> 2) There is at least one host device reporting INSTANT_TETHER_HOST
> support.
> 
> In this scenario, the only possiblity is that this host device has not
> reenrolled yet after receiving the new flags.
> 
> Bug: 893769
> Change-Id: Ib7fd0acdbe80903a499dd0dd42fd60365304371d
> Reviewed-on: https://chromium-review.googlesource.com/c/1277272
> Commit-Queue: Jeremy Klein <jlklein@chromium.org>
> Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#599058}

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

Change-Id: Iee7a71e551e875764f38cdf72391378cdacc80bc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 893769
Reviewed-on: https://chromium-review.googlesource.com/c/1278541Reviewed-by: Jeremy Klein <jlklein@chromium.org>
Commit-Queue: Jeremy Klein <jlklein@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599208}