Remove implicit conversions from scoped_refptr to T* in media/

Remove implicit conversions from scoped_refptr to T* in media/

This patch was generated by running the rewrite_scoped_refptr clang tool
on a Mac build.

BUG=110610
Committed: https://crrev.com/61b83a1c18ec9e4e8ea5fe4795131c6eb6ac2521
Cr-Commit-Position: refs/heads/master@{#295837}

[dcheng, 2014-09-19 17:03:41]

dcheng@chromium.org changed reviewers:
+ vrk@chromium.org

[vrk (LEFT CHROMIUM), 2014-09-19 20:00:09]

The CQ bit was checked by vrk@chromium.org

[vrk (LEFT CHROMIUM), 2014-09-19 20:00:10]

lgtm

[commit-bot: I haz the power, 2014-09-19 20:26:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/584103002/1

[commit-bot: I haz the power, 2014-09-19 20:26:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/584103002/1

[commit-bot: I haz the power, 2014-09-19 20:56:00]

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

[commit-bot: I haz the power, 2014-09-19 20:56:01]

Try jobs failed on following builders:
  ios_rel_device_ninja on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)

[dcheng, 2014-09-20 00:54:53]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2014-09-20 00:56:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/584103002/1

[commit-bot: I haz the power, 2014-09-20 01:01:28]

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

[commit-bot: I haz the power, 2014-09-20 01:01:29]

Failed to apply the patch.

[commit-bot: I haz the power, 2014-09-20 01:01:36]

Committed patchset #1 (id:1) as ee896238aaa0beff09a8b23a343b996e3e17cb06

[commit-bot: I haz the power, 2014-09-20 01:02:17]

Patchset 1 (id:??) landed as
https://crrev.com/61b83a1c18ec9e4e8ea5fe4795131c6eb6ac2521
Cr-Commit-Position: refs/heads/master@{#295837}