Change ThreadChecker to SequencedTaskChecker in internal::Call

Change ThreadChecker to SequencedTaskChecker in internal::Call

In preparation of running DirectTransport on a TaskQueue in unit-tests, change the thread-checkers to sequence-checkers. This is necessary for Mac and iOS, where the TaskQueue is guaranteed to run sequentially, but not guaranteed to do so on only one thread.

TODO: Add the relevant BUGs.

BUG=None

Review-Url: https://codereview.webrtc.org/2999973002
Cr-Commit-Position: refs/heads/master@{#19404}
Committed: https://chromium.googlesource.com/external/webrtc/+/f3f5c0e0317094a0c43749e9ab12cb8c5b181b94

[tommi, 2017-08-18 08:17:25]

tommi@webrtc.org changed reviewers:
+ tommi@webrtc.org

[tommi, 2017-08-18 08:17:26]

lgtm

[eladalon, 2017-08-18 08:36:50]

The CQ bit was checked by eladalon@webrtc.org

[commit-bot: I haz the power, 2017-08-18 08:36:58]

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, 2017-08-18 09:47:10]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1503045410926420,
"parent_rev": "6dfed673ce6d8cc7cac324ae06208f89b22d272d", "commit_rev":
"f3f5c0e0317094a0c43749e9ab12cb8c5b181b94"}

[commit-bot: I haz the power, 2017-08-18 09:47:14]

Description was changed from

==========
Change ThreadChecker to SequencedTaskChecker in internal::Call

In preparation of running DirectTransport on a TaskQueue in unit-tests, change
the thread-checkers to sequence-checkers. This is necessary for Mac and iOS,
where the TaskQueue is guaranteed to run sequentially, but not guaranteed to do
so on only one thread.

TODO: Add the relevant BUGs.

BUG=None
==========

to

==========
Change ThreadChecker to SequencedTaskChecker in internal::Call

In preparation of running DirectTransport on a TaskQueue in unit-tests, change
the thread-checkers to sequence-checkers. This is necessary for Mac and iOS,
where the TaskQueue is guaranteed to run sequentially, but not guaranteed to do
so on only one thread.

TODO: Add the relevant BUGs.

BUG=None

Review-Url: https://codereview.webrtc.org/2999973002
Cr-Commit-Position: refs/heads/master@{#19404}
Committed:
https://chromium.googlesource.com/external/webrtc/+/f3f5c0e0317094a0c43749e9a...
==========

[commit-bot: I haz the power, 2017-08-18 09:47:15]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/external/webrtc/+/f3f5c0e0317094a0c43749e9a...