Fix for bug 191377. r=peterv, sr=heikki, a=asa. window.open("") was not opening a blank window. This was a regression from the fix to bug 174628.

dom/src/base/nsGlobalWindow.cpp

@@ -4323,7 +4323,7 @@ GlobalWindowImpl::OpenInternal(const nsAString& aUrl,
                                nsISupports *aExtraArgument,
                                nsIDOMWindow **aReturn)
 {
-  nsCAutoString url;
+  nsXPIDLCString url;
   nsresult rv = NS_OK;  
 
   *aReturn = nsnull;