Use testharness.js instead of js-test.js in LayoutTests/fast/canvas tests.

third_party/WebKit/LayoutTests/fast/canvas/script-tests/canvas-shadow.js

-description("Some tests for Canvas shadows");
-var ctx = document.createElement('canvas').getContext('2d');
-
-ctx.fillStyle = "green";
-ctx.fillRect(0,0,100,100);
-
-ctx.shadowColor = "green";
-ctx.shadowOffsetX = 0;
-ctx.shadowOffsetY = 0;
-ctx.shadowBlur = 0;
-
-var imageData = ctx.getImageData(0, 0, 200, 50);
-var imgdata = imageData.data;
-shouldBe("imgdata[4]", "0");
-shouldBe("imgdata[5]", "128");
-shouldBe("imgdata[6]", "0");
-
-ctx.clearRect(0,0,200,50);
-
-ctx.shadowColor = "green";
-ctx.shadowOffsetX = 100;
-ctx.shadowOffsetY = 0;
-ctx.shadowBlur = 2;
-
-ctx.fillStyle = "green";
-ctx.fillRect(0,0,100,50);
-
-imageData = ctx.getImageData(110, 10, 80, 30);
-imgdata = imageData.data;
-shouldBe("imgdata[4]", "0");
-shouldBe("imgdata[5]", "128");
-shouldBe("imgdata[6]", "0");