Remove unused base::NthType

Remove unused base::NthType

base::NthType was once added in a prototype of base::Bind refactoring
though it is no longer used in the final code.

BUG=433164
Committed: https://crrev.com/b953d843e9d8b2086e9b093c9a45003e38fd944f
Cr-Commit-Position: refs/heads/master@{#315337}

[tzik, 2015-02-09 07:41:15]

tzik@chromium.org changed reviewers:
+ thakis@chromium.org

[tzik, 2015-02-09 07:41:15]

PTAL, I forgot to remove an unused template from the previous CL.

[Nico, 2015-02-09 14:16:45]

lgtm

[tzik, 2015-02-09 15:05:15]

The CQ bit was checked by tzik@chromium.org

[commit-bot: I haz the power, 2015-02-09 15:06:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/897943003/1

[commit-bot: I haz the power, 2015-02-09 17:57:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-09 17:58:01]

Patchset 1 (id:??) landed as
https://crrev.com/b953d843e9d8b2086e9b093c9a45003e38fd944f
Cr-Commit-Position: refs/heads/master@{#315337}