Move jse_define.h to fxjs/xfa directory.

It is XFA-only but was left out of the mass move at
  https://pdfium-review.googlesource.com/c/47133

Rename its wrapper template method from JSMethod to JSEMethod
to match header naming (JSMethod as it turns out, is also the
name of a similar but unrelated template in the non-xfa code).

Change-Id: I68251290df3621d31b7c3d819e12946b5f9ff0bf
Reviewed-on: https://pdfium-review.googlesource.com/c/47391
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/fxjs/xfa/cjx_boolean.h b/fxjs/xfa/cjx_boolean.h
index 9d35741..0945913 100644
--- a/fxjs/xfa/cjx_boolean.h
+++ b/fxjs/xfa/cjx_boolean.h
@@ -7,8 +7,8 @@
 #ifndef FXJS_XFA_CJX_BOOLEAN_H_
 #define FXJS_XFA_CJX_BOOLEAN_H_
 
-#include "fxjs/jse_define.h"
 #include "fxjs/xfa/cjx_content.h"
+#include "fxjs/xfa/jse_define.h"
 
 class CXFA_Boolean;