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This test became flaky on macOS after r763057 because the code to
initialize the adapter when calling BluetoothTest::WithDefaultAdapter()
was accidentally removed on macOS. This patch restores this logic,
copying what is done on other platforms.

Bug: 1076005
Change-Id: If709274183b668022d55c69f8b9d2a09a9c7dd1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2171442
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763587}