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

third_party/WebKit/LayoutTests/fast/canvas/change-context.html

-This test ensures that changing the context does not crash.
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
 <canvas id="canvas"></canvas><br />
+
 <script>
-if (window.testRunner)
-    testRunner.dumpAsText();
+test(function(t) {
 
-var canvas = document.getElementById("canvas");
-var ctx1 = canvas.getContext("2d");
-var ctx2 = canvas.getContext("");
-ctx1.save();
-
-canvas.parentNode.removeChild(canvas);
-
-if (window.GCController)
-    GCController.collect();
+    var canvas = document.getElementById("canvas");
+    var ctx1 = canvas.getContext("2d");
+    var ctx2 = canvas.getContext("");
+    ctx1.save();
     
-ctx1.save();
-
+    canvas.parentNode.removeChild(canvas);
+    
+    if (window.GCController)
+        GCController.collect();
+        
+    ctx1.save();
+    
+}, 'This test ensures that changing the context does not crash.');
 </script>
+</body>