Remove implicit conversions from scoped_refptr to T* in base/

Remove implicit conversions from scoped_refptr to T* in base/

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

BUG=110610
Committed: https://crrev.com/c041fef8226db56fcec101567c9eef0f9ce49ef5
Cr-Commit-Position: refs/heads/master@{#295855}

[dcheng, 2014-09-19 17:02:22]

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

[rvargas (doing something else), 2014-09-20 00:49:26]

lgtm

[dcheng, 2014-09-20 00:54:39]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2014-09-20 00:56:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/584883003/1

[commit-bot: I haz the power, 2014-09-20 02:58:52]

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

[commit-bot: I haz the power, 2014-09-20 02:58:52]

Exceeded time limit waiting for builds to trigger.

[dcheng, 2014-09-20 03:30:00]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2014-09-20 03:30:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/584883003/1

[commit-bot: I haz the power, 2014-09-20 03:31:31]

Committed patchset #1 (id:1) as 8230d09188493d61c9232c29ccbbd5cd39e90701

[commit-bot: I haz the power, 2014-09-20 03:31:40]

Committed patchset #1 (id:1) as ea05d085b8afeff420a9cb53f5c19fb8088dd251

[commit-bot: I haz the power, 2014-09-20 03:32:06]

Patchset 1 (id:??) landed as
https://crrev.com/c041fef8226db56fcec101567c9eef0f9ce49ef5
Cr-Commit-Position: refs/heads/master@{#295855}