Remove experimental comment on post_task.h and update comment about default traits.

Remove experimental comment on post_task.h and update comment about default traits.

BUG=553459
Review-Url: https://codereview.chromium.org/2628893005
Cr-Commit-Position: refs/heads/master@{#443340}
Committed: https://chromium.googlesource.com/chromium/src/+/f54fb63ff0782eb490a81bf41775b031468f42ca

[gab, 2017-01-12 15:10:12]

The CQ bit was checked by gab@chromium.org to run a CQ dry run

[gab, 2017-01-12 15:10:32]

gab@chromium.org changed reviewers:
+ fdoray@chromium.org

[gab, 2017-01-12 15:10:33]

Francois PTAL, thanks

[commit-bot: I haz the power, 2017-01-12 15:10:37]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[fdoray, 2017-01-12 15:18:23]

lgtm

[commit-bot: I haz the power, 2017-01-12 15:59:01]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-01-12 15:59:02]

Dry run: This issue passed the CQ dry run.

[robliao, 2017-01-12 18:11:56]

robliao@chromium.org changed reviewers:
+ robliao@chromium.org

[robliao, 2017-01-12 18:11:56]

lgtm

[gab, 2017-01-12 20:14:02]

The CQ bit was checked by gab@chromium.org

[commit-bot: I haz the power, 2017-01-12 20:14:57]

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

[commit-bot: I haz the power, 2017-01-12 20:21:41]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484252042093610, "parent_rev":
"6265874469d83f83efc4d6b370d391e8eb29bccb", "commit_rev":
"f54fb63ff0782eb490a81bf41775b031468f42ca"}

[commit-bot: I haz the power, 2017-01-12 20:22:12]

Description was changed from

==========
Remove experimental comment on post_task.h and update comment about default
traits.

BUG=553459
==========

to

==========
Remove experimental comment on post_task.h and update comment about default
traits.

BUG=553459

Review-Url: https://codereview.chromium.org/2628893005
Cr-Commit-Position: refs/heads/master@{#443340}
Committed:
https://chromium.googlesource.com/chromium/src/+/f54fb63ff0782eb490a81bf41775...
==========

[commit-bot: I haz the power, 2017-01-12 20:22:13]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/f54fb63ff0782eb490a81bf41775...