Use scoped_ptr::Pass instead of scoped_ptr::PassAs<T>.

Use scoped_ptr::Pass instead of scoped_ptr::PassAs<T>.

Cleanup to make future migration to std::move() easier.

BUG=423621
Committed: https://crrev.com/103ba304b14008500594318e11785b7f8c45dbf4
Cr-Commit-Position: refs/heads/master@{#300024}

[dcheng, 2014-10-16 22:01:26]

dcheng@chromium.org changed reviewers:
+ creis@chromium.org

[Charlie Reis, 2014-10-16 23:37:34]

LGTM

[dcheng, 2014-10-16 23:40:43]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2014-10-16 23:44:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/660883003/1

[commit-bot: I haz the power, 2014-10-17 00:24:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-17 00:25:25]

Patchset 1 (id:??) landed as
https://crrev.com/103ba304b14008500594318e11785b7f8c45dbf4
Cr-Commit-Position: refs/heads/master@{#300024}