Set position: absolute on NTP thumbnails

Set position: absolute on NTP thumbnails

This fixes a bug where, when using two thumbnails in the same iframe, they would be reordered if their visibility changed. This would only happen on the second and further NTPs, perhaps on relayout by Chrome.

This changes it so that they are superposed, which is how it should have been all along. Putting position: absolute will make both anchor on body.

BUG=None

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=221789

[Mathieu, 2013-09-06 15:30:07]

Hi Jered, PTAL. 

This should have no effect on situations where there is only one thumbnail.

[Jered, 2013-09-06 18:56:11]

On 2013/09/06 15:30:07, Mathieu Perreault wrote:
> Hi Jered, PTAL. 
> 
> This should have no effect on situations where there is only one thumbnail.

lgtm

I'm assuming the thumbnails don't have transparency.

[Mathieu, 2013-09-06 18:58:03]

On 2013/09/06 18:56:11, Jered wrote:
> On 2013/09/06 15:30:07, Mathieu Perreault wrote:
> > Hi Jered, PTAL. 
> > 
> > This should have no effect on situations where there is only one thumbnail.
> 
> lgtm
> 
> I'm assuming the thumbnails don't have transparency.

Thanks. No transparency.

[commit-bot: I haz the power, 2013-09-06 18:58:11]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mathp@chromium.org/23619019/1002

[commit-bot: I haz the power, 2013-09-06 20:47:38]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mathp@chromium.org/23619019/1002

[commit-bot: I haz the power, 2013-09-06 21:47:11]

Change committed as 221789