Merge 187458 "Correctly move script element to a detached document."

Merge 187458 "Correctly move script element to a detached document."

> Correctly move script element to a detached document.
> 
> If a script element ends up being moved over to a new document's tree,
> its script loader is re-associated with that document's script runner
> if the load is still pending. That association of script runner and
> loader needs to reflect document association of the element itself,
> otherwise completion of script loading and any later movement of the
> element to another document will go wrong.
> 
> R=marja,jochen
> BUG=443115
> 
> Review URL: https://codereview.chromium.org/809323002

TBR=sigbjornf@opera.com

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=187772

[sof, 2014-12-30 09:58:46]

Committed patchset #1 (id:1) manually as r187772 (tree was closed).