Fixing race between CallbackCanceled and CancelCallback in AsyncInvoker.

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}
Committed: https://chromium.googlesource.com/external/webrtc/+/b85a88853a651a248078194089e9d5563a41350c

[Taylor Brandstetter, 2017-03-03 06:07:48]

deadbeef@webrtc.org changed reviewers:
+ pthatcher@webrtc.org

[pthatcher1, 2017-03-03 06:40:22]

lgtm

[Taylor Brandstetter, 2017-03-03 18:02:14]

The CQ bit was checked by deadbeef@webrtc.org

[commit-bot: I haz the power, 2017-03-03 18:02:20]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2017-03-03 18:33:18]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1488564134597000, "parent_rev":
"a1991c517598fda9c9c0cf8876886e3968436ff9", "commit_rev":
"b85a88853a651a248078194089e9d5563a41350c"}

[commit-bot: I haz the power, 2017-03-03 18:33:21]

Description was changed from

==========
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
==========

to

==========
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}
Committed:
https://chromium.googlesource.com/external/webrtc/+/b85a88853a651a24807819408...
==========

[commit-bot: I haz the power, 2017-03-03 18:33:22]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/b85a88853a651a24807819408...