Revert of Update image data upon changing the img.crossorigin attribute. (https://codereview.chromium.org/201143002/)

Reason for revert:
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.

Original issue's description:
> 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

TBR=adamk@chromium.org,abarth@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=341047

Review URL: https://codereview.chromium.org/210403002

git-svn-id: svn://svn.chromium.org/blink/trunk@169874 bbb929c8-8fbe-4397-9dbb-9b2b20218538