Stop using script-tests in fast/dom/.

third_party/WebKit/LayoutTests/fast/dom/script-tests/dataset-gc.js

-description("This tests that custom properties on element.dataset persist GC.");
-
-function gc()
-{
-    if (window.GCController)
-        return GCController.collect();
-
-    for (var i = 0; i < 10000; i++) {
-        var s = new String("");
-    }
-}
-
-
-var d = document.createElement("div");
-
-var dataset = d.dataset;
-// Add a property to our prototype. It will be hidden by the corresponding data- attribute.
-dataset.__proto__.customProperty = 1;
-dataset.customProperty = 1; // Now set a property on ourselves.
-shouldBe("d.getAttribute('data-custom-property')", "'1'");
-shouldBe("d.dataset.customProperty", "'1'");
-
-dataset = null;
-
-gc();
-
-// Test that the custom property persisted the GC.
-shouldBe("d.dataset.customProperty", "'1'");