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 Windows build.

BUG=110610
Committed: https://crrev.com/f3c56d51dac268caa4186b27eb3f738ce85b8d20
Cr-Commit-Position: refs/heads/master@{#305277}

[dcheng, 2014-11-21 17:28:10]

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

[rvargas (doing something else), 2014-11-21 18:59:53]

lgtm

[dcheng, 2014-11-21 19:12:31]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2014-11-21 19:13:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/750063002/1

[commit-bot: I haz the power, 2014-11-21 21:01:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-21 21:02:43]

Patchset 1 (id:??) landed as
https://crrev.com/f3c56d51dac268caa4186b27eb3f738ce85b8d20
Cr-Commit-Position: refs/heads/master@{#305277}