Move scoped_ptr.h to rtc_base_approved.

Move scoped_ptr.h to rtc_base_approved.
This is more a formality than anything since scoped_ptr.h is already being included from rtc_base_approved code.

BUG=
R=magjed@webrtc.org

Committed: https://chromium.googlesource.com/external/webrtc/+/c844ca425e8c09bd9545e3956cb85339b50a48ab

[tommi, 2015-08-18 13:02:13]

The CQ bit was checked by tommi@webrtc.org to run a CQ dry run

[commit-bot: I haz the power, 2015-08-18 13:02:17]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1287203007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1287203007/1

[tommi, 2015-08-18 13:02:27]

tommi@webrtc.org changed reviewers:
+ magjed@webrtc.org

[commit-bot: I haz the power, 2015-08-18 13:12:10]

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

[commit-bot: I haz the power, 2015-08-18 13:12:10]

Dry run: Try jobs failed on following builders:
  linux on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/linux/builds/9049)

[magjed_webrtc, 2015-08-19 08:30:58]

lgtm

[tommi (sloooow) - chröme, 2015-08-19 08:31:18]

The CQ bit was checked by tommi@chromium.org

[commit-bot: I haz the power, 2015-08-19 08:31:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1287203007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1287203007/1

[commit-bot: I haz the power, 2015-08-19 08:46:53]

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

[commit-bot: I haz the power, 2015-08-19 08:46:53]

Try jobs failed on following builders:
  linux_rel on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/linux_rel/builds/8910)

[tommi, 2015-08-19 08:51:37]

Committed patchset #1 (id:1) manually as
c844ca425e8c09bd9545e3956cb85339b50a48ab (presubmit successful).