Remove friendship from CXFA_Document to CXFA_SimpleParser.

This no longer seems to be needed (removing causes no issues).

Review-Url: https://codereview.chromium.org/2168483004
diff --git a/xfa/fxfa/parser/cxfa_document.h b/xfa/fxfa/parser/cxfa_document.h
index 8258ab1..dbcfa47 100644
--- a/xfa/fxfa/parser/cxfa_document.h
+++ b/xfa/fxfa/parser/cxfa_document.h
@@ -105,8 +105,6 @@
   CXFA_NodeArray m_pPendingPageSet;
 
  protected:
-  friend class CXFA_SimpleParser;
-
   CXFA_DocumentParser* m_pParser;
   CXFA_ScriptContext* m_pScriptContext;
   CXFA_LayoutProcessor* m_pLayoutProcessor;