Add comment against usage of base::Thread.

Add comment against usage of base::Thread.

base::Create(Sequenced|SingleTreaded)TaskRunnerWithTraits() should
cover most use cases of base::Thread.

R=gab@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2834783004
Cr-Commit-Position: refs/heads/master@{#467005}
Committed: https://chromium.googlesource.com/chromium/src/+/9a6a64f2c851a4bde4ab9e09b2743a7f2d97edf2

[fdoray, 2017-04-21 20:42:21]

PTAL

[gab, 2017-04-25 14:22:12]

The CQ bit was checked by gab@chromium.org

[gab, 2017-04-25 14:22:12]

lgtm

[commit-bot: I haz the power, 2017-04-25 14:22:25]

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, 2017-04-25 16:17:31]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493130132226370, "parent_rev":
"cdda6c444ee67ea8319ca6f63b2981210141a28c", "commit_rev":
"9a6a64f2c851a4bde4ab9e09b2743a7f2d97edf2"}

[commit-bot: I haz the power, 2017-04-25 16:17:43]

Description was changed from

==========
Add comment against usage of base::Thread.

base::Create(Sequenced|SingleTreaded)TaskRunnerWithTraits() should
cover most use cases of base::Thread.

R=gab@chromium.org
BUG=
==========

to

==========
Add comment against usage of base::Thread.

base::Create(Sequenced|SingleTreaded)TaskRunnerWithTraits() should
cover most use cases of base::Thread.

R=gab@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2834783004
Cr-Commit-Position: refs/heads/master@{#467005}
Committed:
https://chromium.googlesource.com/chromium/src/+/9a6a64f2c851a4bde4ab9e09b274...
==========

[commit-bot: I haz the power, 2017-04-25 16:17:44]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/9a6a64f2c851a4bde4ab9e09b274...