Add missing printExtension to print settings for print preview

Add missing printExtension to print settings for print preview

BUG=461888
Committed: https://crrev.com/32b8f25cacbefd083b54402e402e280dbe239063
Cr-Commit-Position: refs/heads/master@{#318852}

[tbarzic, 2015-02-25 23:56:56]

tbarzic@chromium.org changed reviewers:
+ vitalybuka@chromium.org

[tbarzic, 2015-02-25 23:56:57]

When you get a chance, can you test if this fixes the linked bug (it does not
repro on Chrome OS nor Linux; and I don't have other platforms to test :) )

[Vitaly Buka (NO REVIEWS), 2015-02-27 07:08:19]

vitalybuka@chromium.org changed reviewers:
+ alekseys@chromium.org

[Aleksey Shlyapnikov, 2015-02-27 17:48:47]

The CQ bit was checked by alekseys@chromium.org

[Aleksey Shlyapnikov, 2015-02-27 17:48:47]

lgtm

[commit-bot: I haz the power, 2015-02-27 17:49:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/957123002/20001

[commit-bot: I haz the power, 2015-02-27 18:53:58]

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

[commit-bot: I haz the power, 2015-02-27 18:53:59]

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

[Vitaly Buka (NO REVIEWS), 2015-02-27 18:58:49]

On 2015/02/27 18:53:59, I haz the power (commit-bot) wrote:
> Try jobs failed on following builders:
>   android_rel_tests_recipe on tryserver.chromium.linux (JOB_FAILED,
>
http://build.chromium.org/p/tryserver.chromium.linux/builders/android_rel_tes...)

I'll try and CQ later

[Vitaly Buka (NO REVIEWS), 2015-03-03 06:02:35]

lgtm

works on windows and osx

[Vitaly Buka (NO REVIEWS), 2015-03-03 06:02:43]

The CQ bit was checked by vitalybuka@chromium.org

[commit-bot: I haz the power, 2015-03-03 06:03:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/957123002/20001

[commit-bot: I haz the power, 2015-03-03 07:56:05]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-03-03 07:57:00]

Patchset 2 (id:??) landed as
https://crrev.com/32b8f25cacbefd083b54402e402e280dbe239063
Cr-Commit-Position: refs/heads/master@{#318852}