This reverts commit 188adfb51a7c4ca1ab0cbeaffdec4f7cd76857f7.

Reason for revert: https://crbug.com/826787

Original change's description:
> bluetooth: FakeBluetoothChooser impl.
>
> Implements the interfaces that FakeBluetoothChooser overrides. The
> mojom::FakeBluetoothChooser overrides are implemented by running
> |event_handler_| with the appropriate arguments. The BluetoothChooser
> overrides do nothing at the moment, since the base class is only meant
> to update the chooser user interface.
>
> This change also begins to partially convert a Bluetooth chooser test to test
> the interface and deletes the temporary tests that were created to test this
> API.
>
> BUG=719827,719826,824704
>
> Change-Id: I56a04e6bdb2de38d9163d7bc350db578deeb9ba3
> Reviewed-on: https://chromium-review.googlesource.com/962983
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Conley Owens <cco3@chromium.org>
> Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
> Commit-Queue: Ovidio Henriquez <odejesush@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#546509}

TBR=dcheng@chromium.org,cco3@chromium.org,ortuno@chromium.org,odejesush@chromium.org

Change-Id: I0597151ec5878d41ac631b72296203bc99b1f2c8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 719827, 719826, 824704, 826787
Reviewed-on: https://chromium-review.googlesource.com/984299
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546572}