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This reverts commit a5d3ad0f.

Reason for revert: Suspected to break NearbyOnboardingPageTest.All on linux-chromeos-dbg

Original change's description:
> [Nearby] Trigger onboarding when first enabling Nearby
> 
> This CL adds a pref to track if onboarding was run by this user before.
> If it has not, when enabling for the first time, onboarding is run first
> by navigating to the subpage and showing in a dialog. Once onboarding
> has been done once, the user can freely toggle on/off without
> triggering onboarding. However, onboarding will still run if the user
> triggers the pod button and the feature is disabled. This matches the
> Android behavior.
> 
> Additionally, this CL fixes a bug with the premature closing of the
> shared receiveManager which needs to stay alive and connected after the
> dialog closes otherwise getReceiveManager returns a remote with a closed
> pipe.
> 
> Bug: b/154866951
> Change-Id: I1e3cbd15f4995f019b3476c2f7a69f67d6eb1888
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424763
> Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
> Commit-Queue: James Vecore <vecore@google.com>
> Cr-Commit-Position: refs/heads/master@{#809623}

TBR=khorimoto@chromium.org,vecore@google.com

Change-Id: I4bd779c4a17b7ef0560078cefd00287810dab796
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b/154866951, 1131390
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424160Reviewed-by: Tim Schumann <tschumann@chromium.org>
Commit-Queue: Tim Schumann <tschumann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809720}