Remove Selection.containsNode assertion that is not valid.

LayoutTests/editing/selection/contains-node-cleared-document.html

Index: LayoutTests/editing/selection/contains-node-cleared-document.html
diff --git a/LayoutTests/editing/selection/contains-node-crash.html b/LayoutTests/editing/selection/contains-node-cleared-document.html
similarity index 64%
copy from LayoutTests/editing/selection/contains-node-crash.html
copy to LayoutTests/editing/selection/contains-node-cleared-document.html
index ef0c04e93af34a058a72216d71b5fe1b4055acda..d73856642f24f6388ec1490ef6e5f91cde25653f 100644
--- a/LayoutTests/editing/selection/contains-node-crash.html
+++ b/LayoutTests/editing/selection/contains-node-cleared-document.html
@@ -9,10 +9,13 @@ window.onload = function() {
     selection.selectAllChildren(document);
     selection.collapseToEnd();
     var element = document.activeElement;
+    var parent = element.parentNode;
     document.open();

[haraken, 2014/03/26 13:06:30]

I'm not sure if it's needed to open the document to test what you want to test.
You might want to minimize the test case.

[Mads Ager (chromium), 2014/03/26 13:18:00]

This is pretty minimal. It is needed to open the document. That is the point.
That the old document gets removed here and therefore we are asking a selection
of a detached document.

-    document.write("Pass. Test didn't crash.");
+    if (selection.containsNode(element,true))

[haraken, 2014/03/26 13:06:30]

You can just write:

  shouldBeFalse("selection.containsNode(element, true)");

Nit: One space needed before 'true'.

[Mads Ager (chromium), 2014/03/26 13:18:00]

Unfortunately, that does not work. Probably because I'm messing with the
document here. I get null exceptions from the js-test.js code if I do that.

+        document.write("FAIL: selection.containsNode should return false");
+    else
+        document.write("PASS");
     document.close();
-    selection.containsNode(element,true);
 }
 </script>
 </html>