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LayoutTestBluetoothAdapterProvider.

This patch doesn't add any new tests.

Split for easier reviewing. This is the last of two patches to remove
testing from BluetoothDispatcherHost and BluetoothDispatcher:

  [1] http://crrev.com/1125133005
  [2] This patch.

BUG=436284

Review URL: https://codereview.chromium.org/1132943002

Cr-Commit-Position: refs/heads/master@{#330748}