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 Linux build.

BUG=110610
Committed: https://crrev.com/d81e7d7e92f955cc80cc627682db05a24f994bf1
Cr-Commit-Position: refs/heads/master@{#292050}

[dcheng, 2014-08-26 23:17:41]

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

[dcheng, 2014-08-26 23:17:41]

This is the last-ish major CL (though it turns out the clang tool mishandles
base/stl_util.h's ContainsKey and rewrites the template instead). Unfortunately
I still have 20+ pending reviews to land. Once more of these are landed, I can
assess how severe the ContainsKey problem is and take steps to correct it if
necessary.

[willchan no longer on Chromium, 2014-08-26 23:18:37]

lgtm

[dcheng, 2014-08-26 23:19:42]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2014-08-26 23:21:35]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dcheng@chromium.org/510563002/40001

[commit-bot: I haz the power, 2014-08-27 00:23:38]

Committed patchset #3 (40001) as c6fd564f05db1e369a77ba30644ee7ea912d6092

[commit-bot: I haz the power, 2014-09-10 02:48:05]

Patchset 3 (id:??) landed as
https://crrev.com/d81e7d7e92f955cc80cc627682db05a24f994bf1
Cr-Commit-Position: refs/heads/master@{#292050}