Remove implicit conversions from scoped_refptr to T* in android_webview/

Remove implicit conversions from scoped_refptr to T* in android_webview/

Manual fixups for cases the automated tooling elected to skip.

BUG=110610
Committed: https://crrev.com/46256f8d8aa293e87c9d524fbf16b8846a1d203d
Cr-Commit-Position: refs/heads/master@{#298731}

[dcheng, 2014-10-07 22:14:03]

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

[dcheng, 2014-10-07 22:14:03]

Note that in this case, the callback takes a raw pointer anyway, so constructing
a scoped_refptr<> doesn't do much.

[mkosiba (inactive), 2014-10-08 10:47:03]

lgtm

[dcheng, 2014-10-08 16:22:31]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2014-10-08 16:23:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/631313003/1

[commit-bot: I haz the power, 2014-10-08 16:47:05]

Committed patchset #1 (id:1) as dde5f63ff5823357aec52e4ede4216990ccd058c

[commit-bot: I haz the power, 2014-10-08 16:47:49]

Patchset 1 (id:??) landed as
https://crrev.com/46256f8d8aa293e87c9d524fbf16b8846a1d203d
Cr-Commit-Position: refs/heads/master@{#298731}