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A result was unnecessarily moved and possibly used after move
in content::MediaDevicesManager::OnDevicesEnumerated.

Existing unit tests cover the affected code path, although it
does not result in a crash, perhaps because the move is
unnecessary and might be optimized away.

No crashes have been observed in the wild either, except on
a clusterfuzz build that performs IPC directly instead of going
through the getCapabilities() JavaScript API.

Bug: 868241
Change-Id: I2a3d9704a789c67b9eb763e1257504187201f941
Reviewed-on: https://chromium-review.googlesource.com/1154911Reviewed-by: Henrik Boström <hbos@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579026}