DOMException toString is not correct

LayoutTests/fast/canvas/canvas-putImageData.js

 description("This test ensures that putImageData works correctly, the end result should be a 100x100px green square.");
 
 function fillRect(imageData, x, y, width, height, r, g, b, a)
 {
     var bytesPerRow = imageData.width * 4;
     var data =imageData.data;
     for (var i = 0; i < height; i++) {
         var rowOrigin = (y+i) * bytesPerRow;
         rowOrigin += x * 4;
         for (var j = 0; j < width; j++) {
@@ skipping 21 matching lines @@
 }
 
 function pixelShouldBe(x, y, colour) {
     shouldBe("getPixel(" + [x, y] +")", "["+colour+"]");
 }
 
 var canvas = document.getElementById("canvas");
 var context = canvas.getContext("2d");
 
 if (!context.createImageData)
-    context.createImageData = function(w,h) { 
+    context.createImageData = function(w,h) {
         var data = this.getImageData(0, 0, w, h);
         for (var i = 0; i < data.data.length; i++)
             data.data[i] = 0;
     }
 var buffer = context.createImageData(100,100);
 // Fill top left corner
 fillRect(buffer, 0, 0, 50, 50, 0, 128,0,255);
 context.putImageData(buffer, 0, 0);
 pixelShouldBe( 0,  0, [0, 128,0,255]);
 pixelShouldBe(25, 25, [0, 128,0,255]);
@@ skipping 142 matching lines @@
 context.putImageData(smallbuffer, 1, 1, 0.0, 0.0, 8.25, 8.25);
 pixelShouldBe(1, 1, [0, 128,0,255]);
 pixelShouldBe(9, 9, [0, 128,0,255]);
 context.fillRect(1, 1, 7, 7);
 context.putImageData(smallbuffer, 1, 1, 0.5, 0.5, 7.9, 7.9);
 pixelShouldBe(1, 1, [0, 128,0,255]);
 pixelShouldBe(9, 9, [0, 128,0,255]);
 
 
 shouldThrow("context.putImageData({}, 0, 0)", "'TypeError: Type error'");
-shouldThrow("context.putImageData(buffer, NaN, 0, 0, 0, 0, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, NaN, 0, 0, 0, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, 0, NaN, 0, 0, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, 0, 0, NaN, 0, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, NaN, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, 0, NaN)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, Infinity, 0, 0, 0, 0, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, Infinity, 0, 0, 0, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, 0, Infinity, 0, 0, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, 0, 0, Infinity, 0, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, Infinity, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, 0, Infinity)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, undefined, 0, 0, 0, 0, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, undefined, 0, 0, 0, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, 0, undefined, 0, 0, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, 0, 0, undefined, 0, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, undefined, 0)", "'Error: NotSupportedError: DOM Exception 9'");
-shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, 0, undefined)", "'Error: NotSupportedError: DOM Exception 9'");
+shouldThrow("context.putImageData(buffer, NaN, 0, 0, 0, 0, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, NaN, 0, 0, 0, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, 0, NaN, 0, 0, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, 0, 0, NaN, 0, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, NaN, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, 0, NaN)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, Infinity, 0, 0, 0, 0, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, Infinity, 0, 0, 0, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, 0, Infinity, 0, 0, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, 0, 0, Infinity, 0, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, Infinity, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, 0, Infinity)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, undefined, 0, 0, 0, 0, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, undefined, 0, 0, 0, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, 0, undefined, 0, 0, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, 0, 0, undefined, 0, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, undefined, 0)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
+shouldThrow("context.putImageData(buffer, 0, 0, 0, 0, 0, undefined)", "'NotSupportedError: The implementation did not support the requested type of object or operation.'");
 
 // Ensure we don't mess up bounds clipping checks
 var rectcanvas = document.createElement("canvas");
 rectcanvas.width = 20;
 rectcanvas.height = 10;
 var rectbuffer = rectcanvas.getContext("2d");
 rectbuffer.putImageData(smallbuffer, 10, 0);
 
 var rectcanvas = document.createElement("canvas");
 rectcanvas.width = 10;
 rectcanvas.height = 20;
 var rectbuffer = rectcanvas.getContext("2d");
 rectbuffer.putImageData(smallbuffer, 0, 10);