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

third_party/WebKit/LayoutTests/fast/canvas/script-tests/canvas-overloads-fillText.js

-description("Test the behavior of CanvasRenderingContext2D.fillText() when called with different numbers of arguments.");
-
-var ctx = document.createElement('canvas').getContext('2d');
-
-function ExpectedNotEnoughArgumentsMessage(num) {
-    return "\"TypeError: Failed to execute 'fillText' on 'CanvasRenderingContext2D': 3 arguments required, but only " + num + " present.\"";
-}
-
-shouldThrow("ctx.fillText()", ExpectedNotEnoughArgumentsMessage(0));
-shouldThrow("ctx.fillText('moo')", ExpectedNotEnoughArgumentsMessage(1));
-shouldThrow("ctx.fillText('moo',0)", ExpectedNotEnoughArgumentsMessage(2));
-shouldBe("ctx.fillText('moo',0,0)", "undefined");
-shouldBe("ctx.fillText('moo',0,0,0)", "undefined");
-shouldBe("ctx.fillText('moo',0,0,0,0)", "undefined");