Kan-Ru Chen 89fee9ade2 Bug 1362732 - Only delete AbstractThread wrapper when MessageLoop is about to destroy. r=billm
The wrapper should have the same liftime as the underlying
MessageLoop. This patch use the MessageLoop's DestructionObserver to
manage the lifetime of the wrapper.

MozReview-Commit-ID: 44ps4TKl3yQ
2017-05-11 12:22:47 +08:00
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