CroppingWindowCapturer::CreateCapturer() function to replace raw pointer version

CroppingWindowCapturer::CreateCapturer() function to replace raw pointer version

The old CroppingWindowCapturer::Create() function returns a raw pointer, which
cannot explain the ownership.
So this change adds a CreateCapturer() function to return a unique_ptr.

BUG=webrtc:6513
Committed: https://crrev.com/c9a6e4a67ec68d9bc07c1a73ac2a2b54ec484dfa
Cr-Commit-Position: refs/heads/master@{#15045}

[Hzj_jie, 2016-11-11 22:36:56]

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

[commit-bot: I haz the power, 2016-11-11 22:37:06]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[Hzj_jie, 2016-11-11 22:53:28]

zijiehe@chromium.org changed reviewers:
+ jamiewalch@chromium.org, sergeyu@chromium.org

[Sergey Ulanov, 2016-11-11 22:58:41]

lgtm

[commit-bot: I haz the power, 2016-11-11 23:08:07]

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

[commit-bot: I haz the power, 2016-11-11 23:08:08]

Dry run: This issue passed the CQ dry run.

[Hzj_jie, 2016-11-11 23:08:27]

The CQ bit was checked by zijiehe@chromium.org

[commit-bot: I haz the power, 2016-11-11 23:08:38]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2016-11-11 23:13:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-11 23:13:43]

Description was changed from

==========
CroppingWindowCapturer::CreateCapturer() function to replace raw pointer version

The old CroppingWindowCapturer::Create() function returns a raw pointer, which
cannot explain the ownership.
So this change adds a CreateCapturer() function to return a unique_ptr.

BUG=webrtc:6513
==========

to

==========
CroppingWindowCapturer::CreateCapturer() function to replace raw pointer version

The old CroppingWindowCapturer::Create() function returns a raw pointer, which
cannot explain the ownership.
So this change adds a CreateCapturer() function to return a unique_ptr.

BUG=webrtc:6513

Committed: https://crrev.com/c9a6e4a67ec68d9bc07c1a73ac2a2b54ec484dfa
Cr-Commit-Position: refs/heads/master@{#15045}
==========

[commit-bot: I haz the power, 2016-11-11 23:13:44]

Patchset 1 (id:??) landed as
https://crrev.com/c9a6e4a67ec68d9bc07c1a73ac2a2b54ec484dfa
Cr-Commit-Position: refs/heads/master@{#15045}