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

third_party/WebKit/LayoutTests/fast/canvas/canvas-alphaImageData-behavior.js

-description("Series of tests to ensure correct behaviour of getImageData and putImageData when alpha is involved");
-var ctx = document.getElementById('canvas').getContext('2d');
-ctx.fillStyle = 'rgba(255, 0, 0, 0.01)';
-ctx.fillRect(0, 0, 1, 200);
-ctx.fillStyle = 'rgba(0, 255, 0, 0.995)';
-ctx.fillRect(1, 0, 199, 200);
-var imageData = ctx.getImageData(0, 0, 200, 200);
-var imgdata = imageData.data;
-shouldBe("imgdata[4]", "0");
-shouldBe("imgdata[5]", "255");
-shouldBe("imgdata[6]", "0");
-shouldBe("imgdata[7]", "254");
-
-ctx.putImageData(imageData, 0, 0);
-
-imgdata = ctx.getImageData(0, 0, 200, 200).data;
-
-shouldBe("imgdata[4]", "0");
-shouldBe("imgdata[5]", "255");
-shouldBe("imgdata[6]", "0");
-shouldBe("imgdata[7]", "254");