ui: Cleanup the usage of scoped_ptr throughout.

ui: Cleanup the usage of scoped_ptr throughout.

* Makes use make_scoped_ptr() when possible (less typing/noise).

Entries found with the following command line:

$ git grep -E '(=|\breturn)\s*scoped_ptr<.*?>([^)]+)' ui/

BUG=None
R=sky@chromium.org

Committed: https://crrev.com/9b6edf35dd1591b034995589f6cec89ec2863b38
Cr-Commit-Position: refs/heads/master@{#317131}

[tfarina, 2015-02-13 01:41:07]

The presubmit to catch this is in CL https://codereview.chromium.org/919253002/.

[tfarina, 2015-02-18 22:12:50]

tfarina@chromium.org changed reviewers:
+ sadrul@chromium.org

[tfarina, 2015-02-18 22:12:50]

Sadrul, do you mind review this while Scott is OOO?

[sadrul, 2015-02-19 17:20:47]

lgtm

[tfarina, 2015-02-19 19:17:54]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-02-19 19:19:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/922923002/1

[commit-bot: I haz the power, 2015-02-19 19:25:29]

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

[commit-bot: I haz the power, 2015-02-19 19:25:30]

Try jobs failed on following builders:
  linux_chromium_asan_rel on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[tfarina, 2015-02-19 19:43:03]

New patchsets have been uploaded after l-g-t-m from sadrul@chromium.org

[tfarina, 2015-02-19 19:43:17]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-02-19 19:44:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/922923002/20001

[commit-bot: I haz the power, 2015-02-19 20:56:57]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-19 20:57:46]

Patchset 2 (id:??) landed as
https://crrev.com/9b6edf35dd1591b034995589f6cec89ec2863b38
Cr-Commit-Position: refs/heads/master@{#317131}