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

third_party/WebKit/LayoutTests/fast/canvas/canvas-stroke-empty-fill.js

-description("Series of tests to ensure correct behaviour for stroke() on an empty fillStyle() (alpha=0)");
-var ctx = document.createElement('canvas').getContext('2d');
-
-ctx.fillStyle = 'rgba(0,0,0,0)';
-ctx.strokeStyle = 'green';
-ctx.lineWidth = 200;
-ctx.moveTo(0,100);
-ctx.lineTo(200,100);
-ctx.stroke();
-var imageData = ctx.getImageData(0, 0, 100, 100);
-var imgdata = imageData.data;
-shouldBe("imgdata[4]", "0");
-shouldBe("imgdata[5]", "128");
-shouldBe("imgdata[6]", "0");