Remove NonCompositedContentHost -- Take 2

LayoutTests/platform/chromium-mac/compositing/geometry/preserve-3d-switching-expected.txt

 The green box appear angled out from the yellow box and embedded in it.
 
 -webkit-transform: translateZ(-100px) rotateY(45deg);
 (GraphicsLayer
   (bounds 800.00 600.00)
   (children 1
     (GraphicsLayer
       (bounds 800.00 600.00)
       (contentsOpaque 1)
+      (drawsContent 1)
       (children 1
         (GraphicsLayer
           (position 108.00 73.00)
           (bounds 304.00 304.00)
           (childrenTransform [1.00 0.00 0.00 0.00] [0.00 1.00 0.00 0.00] [0.00 0.00 1.00 -0.00] [0.00 0.00 0.00 1.00])
           (children 1
             (GraphicsLayer
               (position 12.00 12.00)
               (bounds 280.00 280.00)
               (opacity 0.80)
@@ skipping 14 matching lines @@
                 )
               )
             )
           )
         )
       )
     )
   )
 )