Merge to XFA: Make (and verify) public/ files compile under C.

public/fpdf_formfill.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
  
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 
 #ifndef _FPDFORMFILL_H
 #define _FPDFORMFILL_H
 #include "fpdfview.h"
@@ skipping 1089 matching lines @@
                                                 int size_x, int size_y, int rotate, int flags);
 /**
  * Function: FPDF_HasXFAField
  *                      This method is designed to check whether a pdf document has XFA fields.
  * Parameters:
  *                      document                -       Handle to document. Returned by FPDF_LoadDocument function.
  *                      docType                 -       Document type defined as DOCTYPE_xxx.
  * Return Value:
  *                      TRUE indicates that the input document has XFA fields, otherwise FALSE.
  **/
-DLLEXPORT FPDF_BOOL STDCALL FPDF_HasXFAField(FPDF_DOCUMENT document, int& docType);
+DLLEXPORT FPDF_BOOL STDCALL FPDF_HasXFAField(FPDF_DOCUMENT document, int* docType);
 
 /**
  * Function: FPDF_LoadXFA
  *                      If the document consists of XFA fields, there should call this method to load XFA fields.
  * Parameters:
  *                      document                -       Handle to document. Returned by FPDF_LoadDocument function.
  * Return Value:
  *                      TRUE indicates success,otherwise FALSE.
  **/
 DLLEXPORT FPDF_BOOL STDCALL FPDF_LoadXFA(FPDF_DOCUMENT document);
@@ skipping 131 matching lines @@
  *                      TRUE indicates success, otherwise FALSE.
  **/
 DLLEXPORT FPDF_BOOL STDCALL FPDF_StringHandleAddString(FPDF_STRINGHANDLE stringHandle, FPDF_BYTESTRING bsText, FPDF_DWORD size);
 
 #ifdef __cplusplus
 };
 #endif
 
 #endif //_FPDFORMFILL_H