Remove foxitlib.h and foxitxfa.h and IWYU.

xfa/src/fxfa/src/fm2js/xfa_lexer.cpp

 // 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
 
+#include "core/include/fxcrt/fx_ext.h"
 #include "xfa/src/fxfa/src/fm2js/xfa_fm2js.h"
 
 namespace {
 
 struct XFA_FMDChar {
   static const FX_WCHAR* inc(const FX_WCHAR*& p) {
     ++p;
     return p;
   }
   static const FX_WCHAR* dec(const FX_WCHAR*& p) {
@@ skipping 524 matching lines @@
   m_pErrorInfo->message.FormatV(lpMessageInfo, ap);
   va_end(ap);
 }
 
 FX_BOOL CXFA_FMLexer::HasError() const {
   if (m_pErrorInfo->message.IsEmpty()) {
     return FALSE;
   }
   return TRUE;
 }