Global constructors should be configurable and not enumerable

LayoutTests/fast/js/script-tests/global-constructors-attributes.js

+description("Test to ensure that global constructors have the right attributes");
+
+function descriptorShouldBe(object, property, expected) {
+    var test = "Object.getOwnPropertyDescriptor(" + object + ", " + property + ")";
+    if ("writable" in expected) {
+        shouldBe(test + ".value", "" + expected.value);
+        shouldBeFalse(test + ".hasOwnProperty('get')");
+        shouldBeFalse(test + ".hasOwnProperty('set')");
+    } else {
+        shouldBe(test + ".get", "" + expected.get);
+        shouldBe(test + ".set", "" + expected.set);
+        shouldBeFalse(test + ".hasOwnProperty('value')");
+        shouldBeFalse(test + ".hasOwnProperty('writable')");
+    }
+    shouldBe(test + ".enumerable", "" + expected.enumerable);
+    shouldBe(test + ".configurable", "" + expected.configurable);
+}
+
+var global = this;
+
+descriptorShouldBe("global", "'CSSRuleList'", {writable: true, enumerable: false, configurable: true, value:"CSSRuleList"});
+descriptorShouldBe("global", "'Document'", {writable: true, enumerable: false, configurable: true, value:"Document"});
+descriptorShouldBe("global", "'Element'", {writable: true, enumerable: false, configurable: true, value:"Element"});
+descriptorShouldBe("global", "'HTMLDivElement'", {writable: true, enumerable: false, configurable: true, value:"HTMLDivElement"});
+descriptorShouldBe("global", "'ProgressEvent'", {writable: true, enumerable: false, configurable: true, value:"ProgressEvent"});
+descriptorShouldBe("global", "'Selection'", {writable: true, enumerable: false, configurable: true, value:"Selection"});
+descriptorShouldBe("global", "'XMLHttpRequest'", {writable: true, enumerable: false, configurable: true, value:"XMLHttpRequest"});