Add a DCHECK in mojo/public/cpp/system/handle.h

Bug: 821030
Change-Id: Iec0c32ba9cc7cb0335e7c320179e2689ab59bba6
Reviewed-on: https://chromium-review.googlesource.com/957918
Reviewed-by: Ken Rockot <[email protected]>
Reviewed-by: John Abd-El-Malek <[email protected]>
Commit-Queue: Helen Li <[email protected]>
Cr-Commit-Position: refs/heads/master@{#550477}
2 files changed