Revert of Add <link rel=next> support to prerender.

Revert of Add <link rel=next> support to prerender. (https://codereview.chromium.org/113803003/)

Reason for revert:
Linux ASAN Tests (2) run 22831 failed with leaks in the RelNextByFieldTrial test.

Original issue's description:
> Add <link rel=next> support to prerender.
> 
> IEs prerender implementation supports rel=next link elements. Let's
> also parse them, and based on a field trial launch these as
> prerenders.
> 
> R=davidben,tburkard,jochen,jschuh@chromium.org
> BUG=329963
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=250280

TBR=davidben@google.com,jochen@chromium.org,tburkard@chromium.org,davidben@chromium.org,jschuh@chromium.org+,jschuh@chromium.org,gavinp@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=329963
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=250299

[Lei Zhang, 2014-02-11 02:44:32]

Created Revert of Add <link rel=next> support to prerender.

[commit-bot: I haz the power, 2014-02-11 02:46:14]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/thestig@chromium.org/145073009/1

[commit-bot: I haz the power, 2014-02-11 02:48:24]

Change committed as 250299