Remove xfa_fm2js.h and IWYU.

testing/libfuzzer/pdf_fm2js_fuzzer.cc

 // Copyright 2016 The 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.
 
 #include <cstddef>
 #include <cstdint>
 
 #include "core/include/fxcrt/fx_basic.h"
 #include "core/include/fxcrt/fx_string.h"
-#include "xfa/src/fxfa/src/fm2js/xfa_fm2js.h"
+#include "xfa/src/fxfa/src/fm2js/xfa_program.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   if (size > std::numeric_limits<FX_STRSIZE>::max())
     return 0;
 
   CFX_WideString input = CFX_WideString::FromUTF8(
       reinterpret_cast<const char*>(data), static_cast<FX_STRSIZE>(size));
   CXFA_FMProgram program;
   if (program.Init(input) || program.ParseProgram())
     return 0;
 
   CFX_WideTextBuf js;
   program.TranslateProgram(js);
   return 0;
 }