Remove implicit conversions from scoped_refptr to T* in ash/

Remove implicit conversions from scoped_refptr to T* in ash/

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

BUG=110610
Committed: https://crrev.com/4da4d40742403e9a9cad302473f4dce1745a149f
Cr-Commit-Position: refs/heads/master@{#304113}

[dcheng, 2014-11-12 22:49:40]

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

[zturner, 2014-11-13 21:56:29]

lgtm

Sorry about the slow response, I'm not actually working on chromium anymore, so
this review request fell under my radar.

[dcheng, 2014-11-13 21:59:03]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2014-11-13 22:00:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/720753003/20001

[commit-bot: I haz the power, 2014-11-13 23:31:00]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-11-13 23:36:27]

Patchset 2 (id:??) landed as
https://crrev.com/4da4d40742403e9a9cad302473f4dce1745a149f
Cr-Commit-Position: refs/heads/master@{#304113}