Merge to XFA: Make the vast majority of JS headers private to src/javascript.

(cherry picked from commit 5b3d0208723f21c50b9922bdc500c9d78c359a25)
Original Review URL: https://codereview.chromium.org/1389783002 .

New changes to fix IWYU in:
  fpdfsdk/include/fpdfxfa/fpdfxfa_app.h
  xfa/include/fxfa/fxfa.h
  xfa/include/fxfa/fxfa_objectacc.h

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1388023003 .
diff --git a/fpdfsdk/src/javascript/resource.cpp b/fpdfsdk/src/javascript/resource.cpp
index 5b6bd48..d99e7ce 100644
--- a/fpdfsdk/src/javascript/resource.cpp
+++ b/fpdfsdk/src/javascript/resource.cpp
@@ -4,7 +4,7 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#include "../../include/javascript/resource.h"
+#include "resource.h"
 
 CFX_WideString JSGetStringFromID(CJS_Context* pContext, FX_UINT id) {
   switch (id) {