Remove transform-origin logic in SVGElement

Remove transform-origin logic in SVGElement, transform-origin was unprefixed by this:

https://codereview.chromium.org/223243002

Review URL: https://codereview.chromium.org/368903002

git-svn-id: svn://svn.chromium.org/blink/trunk@177421 bbb929c8-8fbe-4397-9dbb-9b2b20218538