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

third_party/WebKit/LayoutTests/fast/canvas/script-tests/canvas-font-consistency.js

-descriptionQuiet("Series of tests to ensure that context.font is consistent.");
-
-var canvas = document.createElement('canvas');
-var ctx = canvas.getContext('2d');
-var fontNames = ["bold 13px Arial",
-                 "italic 13px Arial",
-                 "small-caps 13px Arial"];
-
-for (var i = 0; i < fontNames.length; i++) {
-    var fontName = fontNames[i];
-    debug('Testing font "' + fontName + '"');
-    ctx.font = fontName;
-    shouldBe("ctx.font", "fontName");
-}