cc: Remove auto use with smart pointers.

cc: Remove auto use with smart pointers.

This patch removes cc uses of auto with smart pointers. This ensures
that it's explicit and clear what type of smart pointer is being
used.

I think it's better to do this now before this is used as a precedent
for propagating this type of auto use.

R=danakj

Committed: https://crrev.com/39046bbd1a81bccaa8f3a21166d0ba8b7e050117
Cr-Commit-Position: refs/heads/master@{#309363}

[vmpstr, 2014-12-20 08:57:13]

PTAL. I don't know if we want to do this or keep it as is and just disallow auto
for smart pointers in the future. FWIW, it's not that many right now, so we
might as well change it.

[danakj, 2014-12-20 21:07:25]

The CQ bit was checked by danakj@chromium.org

[danakj, 2014-12-20 21:07:26]

lgtm

[commit-bot: I haz the power, 2014-12-20 21:07:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/816193002/20001

[commit-bot: I haz the power, 2014-12-20 21:59:12]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-12-20 22:00:08]

Patchset 2 (id:??) landed as
https://crrev.com/39046bbd1a81bccaa8f3a21166d0ba8b7e050117
Cr-Commit-Position: refs/heads/master@{#309363}