Copy device IDs from advanced constraints
Copy device IDs from advanced constraints

This should allow device switching even when the new device
is specified as an advanced constraint or an old-style "optional".

BUG=589669

Review URL: https://codereview.chromium.org/1806303002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#381752}

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