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

third_party/WebKit/LayoutTests/fast/canvas/canvas-toDataURL-jpeg-crash.html

-Test for <a href="https://bugs.webkit.org/show_bug.cgi?id=69681">bug 69681</a>,
-canvas.toDataURL("image/jpeg") should not crash.<br>
-<p id="log"></p>
-<canvas id="canvas" width="2000" height="2000"></canvas>
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+
+<canvas><canvas id="canvas" width="2000" height="2000"></canvas>
 <script>
-var test = document.getElementById('canvas').toDataURL('image/jpeg');
-// Test passes if we don't crash.
-document.getElementById('log').innerHTML = 'PASS';
-if (window.testRunner)
-    testRunner.dumpAsText();
+test(function() {
+
+    var test = document.getElementById('canvas').toDataURL('image/jpeg');
+
+}, "canvas.toDataURL('image/jpeg') should not crash. (https://bugs.webkit.org/show_bug.cgi?id=69681)"); 
 </script>