Remove outdated comment from content_settings_client.h

Remove outdated comment from content_settings_client.h

The removed comment speaks about StubContentSettingsClient, which was not created in https://codereview.chromium.org/646973002 after all, and thus does not exist in the ToT.

This is a comment-only change, thus skipping tests.

TBR=blundell@chromium.org
NOTRY=true
BUG=393248
Committed: https://crrev.com/8e09bf59a7fdc3966b1c9c00426b347d5e1e72ba
Cr-Commit-Position: refs/heads/master@{#301077}

[vabr (Chromium), 2014-10-24 09:32:50]

Hi Colin,

This is a follow-up on https://codereview.chromium.org/646973002 -- while I
removed the Stub* class there, I forgot a comment about it in the code.

Since this is just a comment (no code) change, and in the spirit of what you
wanted me to do last time, I took the liberty of TBRing you. Please let me know
if that's not OK.

Cheers,
Vaclav

[vabr (Chromium), 2014-10-24 09:32:56]

The CQ bit was checked by vabr@chromium.org

[blundell, 2014-10-24 09:33:31]

lgtm

[commit-bot: I haz the power, 2014-10-24 09:34:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/663933003/1

[commit-bot: I haz the power, 2014-10-24 09:34:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-24 09:35:23]

Patchset 1 (id:??) landed as
https://crrev.com/8e09bf59a7fdc3966b1c9c00426b347d5e1e72ba
Cr-Commit-Position: refs/heads/master@{#301077}