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This change adds a list of abandoned devices to U2fRequest. This list
gets populated, when the request gives up on a device due to an error.
Devices in this list will not be considered when IterateDevice() is
called.

Bug: NONE
Change-Id: I6760b956f2fefa31631379c181224b888ee32902
Reviewed-on: https://chromium-review.googlesource.com/1001897
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549450}