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For the sake of efficiency, we don't fully serialize handles in a
message until we're ready to freeze the message contents for
transmission. Unfortunately we were not properly closing these
partially serialized handles in the event that the message was
never fully serialized before destruction. This fixes that.

R=jcivelli@chromium.org

Bug: 775592
Change-Id: Idac3b11359dc2fcec0699cef779de809575ea163
Reviewed-on: https://chromium-review.googlesource.com/723771Reviewed-by: Jay Civelli <jcivelli@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509600}