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Since default device is always matched as an empty string, we would
sometimes reconnect to a stream which was configured for the wrong
device.

R=guidou

Bug: 1091894
Change-Id: Ia3a33d8f91d984de5ceffbcbb4ddd96efed355e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2468302
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816749}