Cleanup old TODOs that got done or are no longer relevant.

Cleanup old TODOs that got done or are no longer relevant.

BUG=610521
Committed: https://crrev.com/3df75a1d847f616a8ed98aa4715333cbb5320b1d
Cr-Commit-Position: refs/heads/master@{#408222}

[Pete Williamson, 2016-07-27 18:40:06]

petewil@chromium.org changed reviewers:
+ dougarnett@chromium.org

[Pete Williamson, 2016-07-27 18:40:07]

3 of the TODOs got done, just elsewhere in the code, and these didn't get
cleaned up.  The other one, about base::Clock ended up not being needed, we were
able to write tests easily enough without introducing it.

[dougarnett, 2016-07-27 19:03:39]

lgtm

[Pete Williamson, 2016-07-27 19:23:32]

The CQ bit was checked by petewil@chromium.org

[commit-bot: I haz the power, 2016-07-27 19:24:04]

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, 2016-07-27 20:02:44]

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

[commit-bot: I haz the power, 2016-07-27 20:02:46]

Failed to apply the patch.

[commit-bot: I haz the power, 2016-07-27 20:04:49]

Description was changed from

==========
Cleanup old TODOs that got done or are no longer relevant.

BUG=610521
==========

to

==========
Cleanup old TODOs that got done or are no longer relevant.

BUG=610521

Committed: https://crrev.com/3df75a1d847f616a8ed98aa4715333cbb5320b1d
Cr-Commit-Position: refs/heads/master@{#408222}
==========

[commit-bot: I haz the power, 2016-07-27 20:04:50]

Patchset 1 (id:??) landed as
https://crrev.com/3df75a1d847f616a8ed98aa4715333cbb5320b1d
Cr-Commit-Position: refs/heads/master@{#408222}