Make Range.detach() a no-op

LayoutTests/fast/dom/Range/resources/intersectsNode.js

 description(
 "This test checks the behavior of the intersectsNode() method on the Range object.<br>" +
 "It covers all configurations of the node/Range relationship and some exception conditions."
 );
 
 var range = document.createRange();
 var intersects = 0;
 
 debug("1.1 Node starts before the range and ends before the range");
 range.selectNode(document.getElementById("a2"));
@@ skipping 76 matching lines @@
 
 debug("1.13 Range starts at 0 and ends at 1");
 range.setStart(document.getElementById("b2"), 0);
 range.setEnd(document.getElementById("b2"), 1);
 intersects = range.intersectsNode(document.getElementById("b2"));
 shouldBeTrue("intersects");
 debug("");
 
 debug("2.1 Detached Range, attached node");
 var detachedRange = document.createRange();
-detachedRange.detach();
-shouldThrow("detachedRange.intersectsNode(document.getElementById('a1'))", '"InvalidStateError: Failed to execute \'intersectsNode\' on \'Range\': The range has no container. Perhaps \'detach()\' has been invoked on this object?"');
+detachedRange.detach(); // No-op.
+shouldBeFalse("detachedRange.intersectsNode(document.getElementById('a1'))");
 debug("");
 
 debug("2.2 attached range, detached node");
 // firefox does not throw an exception but returns 0
 range.selectNode(document.getElementById("a1"));
 var node = document.getElementById("b1");
 node.parentNode.removeChild(node);
 intersects = range.intersectsNode(node);
 shouldBeFalse("intersects");
 debug("");
@@ skipping 28 matching lines @@
 debug("");
 
 debug("2.6 Node deleted");
 range.selectNode(document.getElementById("a2"));
 var node = null;
 shouldThrow("range.intersectsNode(node)");
 debug("");
     
 if (window.testRunner)
     testRunner.dumpAsText();