Remove SVGUseElement.instanceRoot and all tests that depend on it
Created attachment 245610 [details] Patch
The Windows EWS failure is simply the Windows platform having trouble applying the patch with line ending changes. The GTK and EFL bots are failing to build because http://trac.webkit.org/changeset/179326 broke the build on those platforms.
Committed r179391: <http://trac.webkit.org/changeset/179391>