Fix relayout-fixed-position-after-scale.html to work with virtual-viewport.

Fix relayout-fixed-position-after-scale.html to work with virtual-viewport.

This test was using removed internal methods and didn't set a minimum page
scale which is now needed for position-fixed elements to correctly get their
percentage based size.

BUG=225184
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=201149

[bokan, 2015-08-25 18:37:33]

bokan@chromium.org changed reviewers:
+ aelias@chromium.org

[aelias_OOO_until_Jul13, 2015-08-25 18:50:02]

lgtm

[bokan, 2015-08-25 18:50:22]

The CQ bit was checked by bokan@chromium.org

[commit-bot: I haz the power, 2015-08-25 18:50:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1318543005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1318543005/1

[commit-bot: I haz the power, 2015-08-25 19:19:11]

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

[commit-bot: I haz the power, 2015-08-25 19:19:12]

Try jobs failed on following builders:
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[bokan, 2015-08-25 20:06:46]

The CQ bit was checked by bokan@chromium.org

[commit-bot: I haz the power, 2015-08-25 20:07:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1318543005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1318543005/1

[commit-bot: I haz the power, 2015-08-25 20:41:57]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=201149