Remove OwnPtr::release() calls in platform/ (part 1).

Remove OwnPtr::release() calls in platform/ (part 1).

OwnPtr::release() calls can be (1) replaced with std::move(), or
(2) removed entirely (in certain "return" statements).

BUG=611660
Committed: https://crrev.com/86942e7ae38c7f37635ce1ea62e38420a8014f0b
Cr-Commit-Position: refs/heads/master@{#394060}

[Yuta Kitamura, 2016-05-16 06:33:08]

The CQ bit was checked by yutak@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-05-16 06:33:32]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1981823002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1981823002/1

[Yuta Kitamura, 2016-05-16 06:35:59]

yutak@chromium.org changed reviewers:
+ haraken@chromium.org, tzik@chromium.org

[Yuta Kitamura, 2016-05-16 06:35:59]

yutak@chromium.org changed required reviewers:
+ haraken@chromium.org, tzik@chromium.org

[Yuta Kitamura, 2016-05-16 06:36:00]

tzik: PTAL?
+haraken for platform/ approval.

[haraken, 2016-05-16 06:46:33]

LGTM

[commit-bot: I haz the power, 2016-05-16 11:14:29]

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

[commit-bot: I haz the power, 2016-05-16 11:14:32]

Dry run: This issue passed the CQ dry run.

[tzik, 2016-05-17 04:58:27]

lgtm

[Yuta Kitamura, 2016-05-17 05:15:03]

The CQ bit was checked by yutak@chromium.org

[commit-bot: I haz the power, 2016-05-17 05:15:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1981823002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1981823002/1

[commit-bot: I haz the power, 2016-05-17 05:22:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-17 05:24:19]

Description was changed from

==========
Remove OwnPtr::release() calls in platform/ (part 1).

OwnPtr::release() calls can be (1) replaced with std::move(), or
(2) removed entirely (in certain "return" statements).

BUG=611660
==========

to

==========
Remove OwnPtr::release() calls in platform/ (part 1).

OwnPtr::release() calls can be (1) replaced with std::move(), or
(2) removed entirely (in certain "return" statements).

BUG=611660

Committed: https://crrev.com/86942e7ae38c7f37635ce1ea62e38420a8014f0b
Cr-Commit-Position: refs/heads/master@{#394060}
==========

[commit-bot: I haz the power, 2016-05-17 05:24:20]

Patchset 1 (id:??) landed as
https://crrev.com/86942e7ae38c7f37635ce1ea62e38420a8014f0b
Cr-Commit-Position: refs/heads/master@{#394060}