Remove anchorPoint from WebLayer and GraphicsLayer.

LayoutTests/compositing/layer-creation/overlap-transformed-layer-with-transform-body-expected.txt

 (GraphicsLayer
   (bounds 800.00 600.00)
   (children 1
     (GraphicsLayer
       (bounds 800.00 600.00)
       (contentsOpaque 1)
       (drawsContent 1)
       (children 1
         (GraphicsLayer
           (position 8.00 8.00)
           (bounds 784.00 584.00)
           (drawsContent 1)
           (children 2
             (GraphicsLayer
               (position 15.00 0.00)
-              (anchor 1.47 0.00)
               (transformOrigin 377.00 0.00)
               (bounds 256.00 256.00)
               (contentsOpaque 1)
               (drawsContent 1)
               (transform [1.00 0.00 0.00 0.00] [0.00 1.00 0.00 0.00] [0.00 0.00 1.00 0.00] [-10.00 0.00 0.00 1.00])
               (children 1
                 (GraphicsLayer
                   (position 385.00 0.00)
                 )
               )
             )
             (GraphicsLayer
               (bounds 300.00 300.00)
               (contentsOpaque 1)
               (drawsContent 1)
               (backgroundColor #008000)
             )
           )
         )
       )
     )
   )
 )