Supervised user interstitial: Remove image URL resolving hack.

Supervised user interstitial: Remove image URL resolving hack.

The URL now contains a protocol (b/17204752) so we don't need this anymore.

BUG=404671
Committed: https://crrev.com/885fee17a8df62e0ab51c06742d55f459bae6ea8
Cr-Commit-Position: refs/heads/master@{#292590}

[Marc Treib, 2014-08-28 14:11:44]

treib@chromium.org changed reviewers:
+ bauerb@chromium.org

[Marc Treib, 2014-08-28 14:11:44]

PTAL!

[Bernhard Bauer, 2014-08-28 15:08:39]

lgtm

[Marc Treib, 2014-08-28 15:09:16]

The CQ bit was checked by treib@chromium.org

[commit-bot: I haz the power, 2014-08-28 15:09:42]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/treib@chromium.org/509173005/1

[commit-bot: I haz the power, 2014-08-28 16:02:35]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  mac_gpu_retina_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu_retina_tr...)

[commit-bot: I haz the power, 2014-08-28 16:30:14]

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

[commit-bot: I haz the power, 2014-08-28 16:30:15]

Try jobs failed on following builders:
  mac_gpu_retina_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu_retina_tr...)

[Marc Treib, 2014-08-29 07:45:04]

The CQ bit was checked by treib@chromium.org

[commit-bot: I haz the power, 2014-08-29 07:45:18]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/treib@chromium.org/509173005/1

[commit-bot: I haz the power, 2014-08-29 08:08:08]

Committed patchset #1 (id:1) as f66cd0031d9df64dfd896080af1f81a5276597fe

[commit-bot: I haz the power, 2014-09-10 03:06:58]

Patchset 1 (id:??) landed as
https://crrev.com/885fee17a8df62e0ab51c06742d55f459bae6ea8
Cr-Commit-Position: refs/heads/master@{#292590}