Fix AJAX file upload to support guess file encoding without throwing exception. Fix to MySpaces portlet in Liferay (AWC-1330). Fix to authentication issue with portlets in Liferay

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@6210 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/web/app/servlet/AuthenticationHelper.java

@@ -434,12 +434,11 @@ public final class AuthenticationHelper
          // Portal vendor has decided to encode the objects in the session
          if (portalUserKeyName.get() == null)
          {
-            String userKeyPostfix = "?" + AUTHENTICATION_USER; 
             Enumeration enumNames = session.getAttributeNames();
             while (enumNames.hasMoreElements())
             {
                String name = (String)enumNames.nextElement();
-               if (name.endsWith(userKeyPostfix))
+               if (name.endsWith(AUTHENTICATION_USER))
                {
                   // cache the key value once found!
                   portalUserKeyName.set(name);