Move wheel event dispatch from Node to Element.
<https://webkit.org/b/121908> Reviewed by Anders Carlsson. Wheel events are only ever dispatched on Elements, so move the logic out of Node. Had to make RenderBox::scroll() and friends return a stopElement instead of a stopNode (out argument) to make this work, though it was only ever returning Elements there anyway. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@156397 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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