Revert of Oilpan: fix build after r180052.

Revert of Oilpan: fix build after r180052. (https://codereview.chromium.org/460983002/)

Reason for revert:
Android Builder failed to compile

Original issue's description:
> Oilpan: fix build after r180052.
> 
> TBR=haraken,oilpan-reviews
> BUG=383813
> NOTRY=true
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180061

TBR=haraken@chromium.org,oilpan-reviews@chromium.org,sigbjornf@opera.com
NOTREECHECKS=true
NOTRY=true
BUG=383813
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180062

[Fabrice (no longer in Chrome), 2014-08-12 11:12:37]

Created Revert of Oilpan: fix build after r180052.

[commit-bot: I haz the power, 2014-08-12 11:13:16]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/fdegans@chromium.org/461963002/1

[commit-bot: I haz the power, 2014-08-12 11:13:17]

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

[commit-bot: I haz the power, 2014-08-12 11:13:19]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[haraken, 2014-08-12 11:14:34]

LGTM (though I'm not sure why it broke Android bots).

[haraken, 2014-08-12 11:14:45]

The CQ bit was checked by haraken@chromium.org

[commit-bot: I haz the power, 2014-08-12 11:15:19]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/fdegans@chromium.org/461963002/1

[commit-bot: I haz the power, 2014-08-12 11:15:52]

Change committed as 180062

[sof, 2014-08-12 11:27:14]

On 2014/08/12 11:14:34, haraken wrote:
> LGTM (though I'm not sure why it broke Android bots).

It gets confused by not being within the namespace scope -
https://codereview.chromium.org/463633004/ does that instead.