Deprecate Element.offsetParent/offsetTop/offsetLeft/offsetWidth/offsetHeight

LayoutTests/svg/repaint/mask-clip-target-transform-expected.txt

+CONSOLE WARNING: 'Element.offsetTop' is deprecated and will be removed in M47, around Novemver 2015. The offset* attributes are only standardized and widely supported for HTML elements
 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
         [150, 100, 100, 50],
         [100, 150, 50, 100],
         [100, 0, 200, 300],
         [100, 0, 200, 300],
         [50, 150, 100, 100],
         [0, 100, 300, 200],
         [0, 0, 300, 100]
       ],
       "paintInvalidationClients": [
         "LayoutSVGContainer g",
         "LayoutSVGRect rect id='masker'",
         "LayoutSVGContainer g",
         "LayoutSVGRect rect id='clipper'"
       ]
     }
   ]
 }