Remove xfa_fm2js.h and IWYU.

xfa/src/fxfa/src/fm2js/xfa_error.cpp

Index: xfa/src/fxfa/src/fm2js/xfa_error.cpp
diff --git a/xfa/src/fxfa/src/fm2js/xfa_error.cpp b/xfa/src/fxfa/src/fm2js/xfa_error.cpp
index a7d061f1e955ffd6867582fde6ba417673f45f11..fdeee363bb1f53cd590edd6a4c529d8c6029e9fe 100644
--- a/xfa/src/fxfa/src/fm2js/xfa_error.cpp
+++ b/xfa/src/fxfa/src/fm2js/xfa_error.cpp
@@ -4,17 +4,17 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#include "xfa/src/fxfa/src/fm2js/xfa_fm2js.h"
-static const FX_WCHAR* gs_lpStrErrorMsgInfo[] = {
+#include "xfa/src/fxfa/src/fm2js/xfa_error.h"
+
+static const FX_WCHAR* const gs_lpStrErrorMsgInfo[] = {
     L"unsupported char '%c'",         L"bad suffix on number",
     L"invalidate char '%c'",          L"expected identifier instead of '%s'",
     L"expected '%s' instead of '%s'", L"expected 'endif' instead of '%s'",
     L"unexpected expression '%s'",    L"expected operator '%s' instead of '%s'",
 };
+
 const FX_WCHAR* XFA_FM_ErrorMsg(XFA_FM_ERRMSG msg) {
-  if (msg < FMERR_MAXIMUM) {
+  if (msg < FMERR_MAXIMUM)
     return gs_lpStrErrorMsgInfo[msg];
-  } else {
-    return L"";
-  }
+  return L"";
 }