exo: Remove spurious DCHECK in ReclaimResource

crrev.com/c/2584953002 fixed an issue where a resource would be returned
to FrameSinkResourceManager and the associated release callback could
not be found.

A DCHECK that the release callback had to be found was left in that CL.
This CL removes the spurious DCHECK.

Change-Id: Ida8b76f6a4024b94c81ffeb90f02da8ea373b794
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1527324
Auto-Submit: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641578}
1 file changed