deadbeef b85a88853a Fixing race between CallbackCanceled and CancelCallback in AsyncInvoker.
Pointer was already protected by a critical section in two places but
not the third. Added thread annotations to prevent this from happening
in the future.

BUG=None

Review-Url: https://codereview.webrtc.org/2726263004
Cr-Commit-Position: refs/heads/master@{#17017}
2017-03-03 18:33:18 +00:00
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