Fixed bug 41772, if XLink target was XML file it never opened it in new window. r=jst.

uriloader/base/nsURILoader.cpp

@@ -515,7 +515,9 @@ NS_IMETHODIMP nsURILoader::GetTarget(const char * aWindowTarget,
   nsCOMPtr<nsIDocShellTreeItem>  treeItem;
   *aRetargetedWindowContext = nsnull;
 
-  if(!name.Length() || name.EqualsIgnoreCase("_self") || name.EqualsIgnoreCase("_blank"))
+  if(!name.Length() || name.EqualsIgnoreCase("_self") || 
+    name.EqualsIgnoreCase("_blank") || 
+    name.EqualsIgnoreCase("_new"))
   {
      *aRetargetedWindowContext = aWindowContext;
   }

xpfe/browser/src/nsBrowserInstance.cpp

@@ -2324,6 +2324,11 @@ static nsModuleComponentInfo components[] = {
     NS_CONTENT_HANDLER_PROGID_PREFIX"text/rdf", 
     nsBrowserContentHandlerConstructor 
   },
+  { "Browser Content Handler",
+    NS_BROWSERCONTENTHANDLER_CID,
+    NS_CONTENT_HANDLER_PROGID_PREFIX"text/xml", 
+    nsBrowserContentHandlerConstructor 
+  },
   { "Browser Content Handler",
     NS_BROWSERCONTENTHANDLER_CID,
     NS_CONTENT_HANDLER_PROGID_PREFIX"text/css",