Christopher Tate 12f783d6c6 Don't crash when backup timeout races with agent completion
There's a narrow window of time in which an agent reporting that its
operation has completed races with timeouts such that we wind up
handling the completion callback just after certain fundamental state
has been reset.  Detect this race and proceed gracefully instead of
crashing.

Bug 19498669

Change-Id: I5a475527db1a55a8e567366ddfb10112e427682e
2015-02-24 17:37:54 -08:00
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