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The device lost callback is stored in a unique_ptr since it may
never be called. If it's never called we need to free the allocation
on GPUDevice deletion. However, if it is called, we should release
the managed pointer since the callback is self-deleting.

Bug: 1160448
Change-Id: I780eae1dcb8fac34a0128351f47224c83d8c6727
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612120Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841173}