The node and allowPartialContainment arguments for Selection API should not be optional

LayoutTests/editing/selection/containsNode.html

Index: LayoutTests/editing/selection/containsNode.html
diff --git a/LayoutTests/editing/selection/containsNode.html b/LayoutTests/editing/selection/containsNode.html
index 3c16b67eefb7a60e6b619cc1727a9ef08b91adb0..4d50873f8f34df89ff41beeabcb132f7a5e62de3 100644
--- a/LayoutTests/editing/selection/containsNode.html
+++ b/LayoutTests/editing/selection/containsNode.html
@@ -23,6 +23,15 @@ function shouldBe(expr, expected) {
         log("Success: " + expr + " is " + expected + ".");
 }
 
+function shouldThrow(expr) {
+    try {
+        eval(expr);
+        log("Failure: " + expr + " didn't raise an exception" + ".");
+    } catch (ex) {
+        log("Success: " + expr + " raised " + ex + ".");
+    }
+}
+
 if (window.testRunner)
     testRunner.dumpAsText();
 
@@ -33,8 +42,8 @@ r.setStart(span1, 1);
 r.setEnd(span1, 2);
 s.addRange(r);
 
-shouldBe('s.containsNode(null, false)', false);
-shouldBe('s.containsNode(null, true)', false);
+shouldThrow("s.containsNode(null, false);");
+shouldThrow("s.containsNode(null, true);");
 shouldBe('s.containsNode(testDiv, false)', false);
 shouldBe('s.containsNode(testDiv, true)', true);
 shouldBe('s.containsNode(span1, false)', false);