Clean up final uses of scoped_ptr<T>::PassAs() and remove it.

Clean up final uses of scoped_ptr<T>::PassAs() and remove it.

This helper to upcast in return statements is no longer needed.

BUG=423621
Committed: https://crrev.com/19b6b65f39712670a4bf8289cdeb4992c62ef27c
Cr-Commit-Position: refs/heads/master@{#300548}

[dcheng, 2014-10-21 01:29:29]

dcheng@chromium.org changed reviewers:
+ danakj@chromium.org, rsleevi@chromium.org

[dcheng, 2014-10-21 01:29:30]

All hail C++11.

[dcheng, 2014-10-21 01:29:41]

(danakj for base + cc changes, rsleevi for net changes)

[danakj, 2014-10-21 16:01:13]

On 2014/10/21 01:29:41, dcheng wrote:
> (danakj for base + cc changes, rsleevi for net changes)

LGTM

[Ryan Sleevi, 2014-10-21 17:44:26]

lgtm

[dcheng, 2014-10-21 17:45:28]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2014-10-21 17:47:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/663243003/1

[commit-bot: I haz the power, 2014-10-21 19:41:29]

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

[commit-bot: I haz the power, 2014-10-21 19:41:30]

Try jobs failed on following builders:
  win_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu_triggered...)

[dcheng, 2014-10-21 20:00:13]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2014-10-21 20:01:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/663243003/1

[commit-bot: I haz the power, 2014-10-21 20:30:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-21 20:31:02]

Patchset 1 (id:??) landed as
https://crrev.com/19b6b65f39712670a4bf8289cdeb4992c62ef27c
Cr-Commit-Position: refs/heads/master@{#300548}