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Having these API wrapper objects be globals is dangerous because each
BluetoothTaskManagerWin creates a new task runner on which to run
Bluetooth tasks. Since this is the only class that uses these objects
it can just own them instead.

To simplify things the weak HANDLE reference in BluetoothTaskManagerWin
has also been removed.

Bug: 820864
Change-Id: I2abaca53c1b7388503e0f18ac6a004426f0e95ac
Reviewed-on: https://chromium-review.googlesource.com/1117445
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575015}