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Before Dawn implemented DeviceLostCallback, we were using
UncapturedErrorCallback to handle device lost errors.

Bug: dawn:68
Change-Id: I6d603f2d54f34d7e25c6f12fe4ee1098c5da53b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363387
Commit-Queue: Natasha Lee <natlee@microsoft.com>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806279}