Update image data upon changing the img.crossorigin attribute.

Update image data upon changing the img.crossorigin attribute.

The spec tells us that setting the crossorigin attribute on an img
element should cause the "update the image data" steps to be invoked,

 http://www.whatwg.org/specs/web-apps/current-work/#update-the-image-data

Do so here, along with updating the underlying test's expectation.

R=
BUG=341047
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=169382

[sof, 2014-03-16 14:25:12]

When you have a moment, please take a look.

[abarth-chromium, 2014-03-17 18:26:59]

lgtm

[sof, 2014-03-17 18:57:16]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2014-03-17 18:57:23]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sigbjornf@opera.com/201143002/20001

[commit-bot: I haz the power, 2014-03-17 19:34:30]

Change committed as 169382

[sof, 2014-03-24 20:48:24]

A revert of this CL has been created in
https://codereview.chromium.org/210403002/ by sigbjornf@opera.com.

The reason for reverting is: The re-issuing of another image load upon setting
'crossorigin' has been reported to cause a site problem (a Google internal
site/service.)

Until diagnosed and understood fully, let's back this one out..