Remove non-standard API entry points in CanvasRenderingContext2D

LayoutTests/fast/canvas/resources/shadow-offset.js

 test = function(setter) {
     document.body.appendChild(document.createElement("p")).appendChild(document.createTextNode("There should be no red pixels below."));
     var canvas = document.body.appendChild(document.createElement("canvas"));
     canvas.width = "400";
     canvas.height = "400";
     canvas.style.backgroundColor = "white";
     var ctx = canvas.getContext('2d');
     var w = 10;
     var h = 10;
 
     var y = 10;
     for (var offsetY = -10; offsetY <= 10; offsetY++) {
         var x = 10;
         for (var offsetX = -10; offsetX <= 10; offsetX++) {
-            ctx.setShadow(0, 0, 0, "transparent");
+            ctx.shadowOffsetX = 0;
+            ctx.shadowOffsetY = 0
+            ctx.shadowBlur = 0;
+            ctx.shadowColor = "transparent";
         
             ctx.fillStyle = 'red';
             ctx.fillRect(x + offsetX, y + offsetY, w, h);
     
             setter(ctx, offsetX, offsetY);
         
             ctx.fillStyle = 'white';
             ctx.fillRect(x, y, w, h);
 
             x += w + Math.abs(offsetX) + 2;
         }
         y += h + Math.abs(offsetY) + 2;
     }
 }