Fix tests failures caused by issue 906493004.

Fix tests failures caused by issue 906493004 (https://codereview.chromium.org/906493004/).

The failed tests were caused by missing the initialization of consumer_instance_type_ in UserScript.

BUG=463906
TBR=rdevlin

Committed: https://crrev.com/8806af42f41a804d3b4203dd042ce71983af886f
Cr-Commit-Position: refs/heads/master@{#319207}

[Xi Han, 2015-03-05 01:17:18]

hanxi@chromium.org changed reviewers:
+ thakis@chromium.org

[Xi Han, 2015-03-05 01:17:19]

Hi Nic: please take a look, thanks!

[Xi Han, 2015-03-05 01:27:57]

hanxi@chromium.org changed reviewers:
+ rdevlin.cronin@chromium.org

[Xi Han, 2015-03-05 01:27:58]

Hi Devlin: Please review all changes, thanks!

[Nico, 2015-03-05 01:56:43]

On 2015/03/05 01:27:58, Xi Han wrote:
> Hi Devlin: Please review all changes, thanks!

Lgtm

[Nico, 2015-03-05 01:56:49]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2015-03-05 01:57:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/976173002/1

[Nico, 2015-03-05 01:59:18]

Rdevlin: still needs your seal of approvers for owners, I figured kicking
the CQ will make this land faster once that's there (since most bits are
already green then)
On Mar 4, 2015 5:57 PM, <commit-bot@chromium.org> wrote:

> CQ is trying da patch. Follow status at
>  https://chromium-cq-status.appspot.com/patch-status/976173002/1
>
>
> https://codereview.chromium.org/976173002/
>

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[commit-bot: I haz the power, 2015-03-05 03:13:36]

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

[commit-bot: I haz the power, 2015-03-05 03:13:38]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[Nico, 2015-03-05 03:40:19]

IMA tbr it as it'll get our bots green.

[Nico, 2015-03-05 03:40:48]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2015-03-05 03:41:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/976173002/1

[commit-bot: I haz the power, 2015-03-05 03:44:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-05 03:45:49]

Patchset 1 (id:??) landed as
https://crrev.com/8806af42f41a804d3b4203dd042ce71983af886f
Cr-Commit-Position: refs/heads/master@{#319207}