Revert of [Easy Unlock] Port the BluetoothConnectionFinder class to native code.

Revert of [Easy Unlock] Port the BluetoothConnectionFinder class to native code. (patchset #4 id:320001 of https://codereview.chromium.org/633253002/)

Reason for revert:
Causes compile failure on mac:
http://build.chromium.org/p/chromium.mac/builders/Mac%20Builder%20%28dbg%29/builds/75518

Original issue's description:
> [Easy Unlock] Port the BluetoothConnectionFinder class to native code.
>
> A couple of pieces are left as TODOs for future CLs:
>   * Porting the "seek device by Bluetooth address" feature.
>   * Wiring up a screen lock state accessor.
>
> BUG=420946
> TEST=components_unittests
> R=tengs@chromium.org
>
> Committed: https://crrev.com/ac4df1c4df6fdc7c771eb0bdeb15dbd6f2dbb98c
> Cr-Commit-Position: refs/heads/master@{#299415}

TBR=tengs@chromium.org,isherman@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=420946
Committed: https://crrev.com/ab9f183ccbec50c1bfa42514019e089fccd9f0f4
Cr-Commit-Position: refs/heads/master@{#299420}

[yoichio, 2014-10-14 03:37:38]

Created Revert of [Easy Unlock] Port the BluetoothConnectionFinder class to
native code.

[commit-bot: I haz the power, 2014-10-14 03:38:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/651073002/1

[commit-bot: I haz the power, 2014-10-14 03:38:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-14 03:39:36]

Patchset 1 (id:??) landed as
https://crrev.com/ab9f183ccbec50c1bfa42514019e089fccd9f0f4
Cr-Commit-Position: refs/heads/master@{#299420}

[Ilya Sherman, 2014-10-14 23:15:20]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/656963002/ by isherman@chromium.org.

The reason for reverting is: I believe that the original revert was incorrect,
so relanding the change..