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This reverts commit 706a5c51.

Reason for revert: Speculative revert for https://ci.chromium.org/p/chromium/builders/ci/Mac10.12%20Tests
https://crbug.com/1109738

Original change's description:
> [Nearby] Start discovery on discovery page
> 
> This calls the DiscoveryManager interface from JS and listens for
> discovered and lost devices to update the device list. The selected
> device is then passed through to the confirmation-page.
> 
> Bug: 1103190
> Change-Id: I9296e5449533eb869fd9f20fe442d4ac1bc05a42
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315862
> Commit-Queue: Richard Knoll <knollr@chromium.org>
> Reviewed-by: Michael van Ouwerkerk <mvanouwerkerk@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#791591}

TBR=mvanouwerkerk@chromium.org,knollr@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1103190
Change-Id: I80a3d398897ca3f77b41f0d72012d1039773583c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320272Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791814}