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My understanding is that the refcount should not be higher than the
number of dispatchers which should be tied to the lifetimes of process
hosts.  A 32 bit refcount should be safe in this case, but a size_t
refcount is more obviously safe.

Bug: 1101547
Change-Id: Icd52147b48c87df609dd43716f710a8decdc2c27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2289371Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793018}