Merge to XFA: Do some IWYU cleanups.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1176333002.

(cherry picked from commit 0ef0de55657db8a83372ad8eb22d84c5893afc4c)

Review URL: https://codereview.chromium.org/1195943005.
diff --git a/fpdfsdk/include/javascript/IJavaScript.h b/fpdfsdk/include/javascript/IJavaScript.h
index a8bdd65..1d9396f 100644
--- a/fpdfsdk/include/javascript/IJavaScript.h
+++ b/fpdfsdk/include/javascript/IJavaScript.h
@@ -7,7 +7,8 @@
 #ifndef FPDFSDK_INCLUDE_JAVASCRIPT_IJAVASCRIPT_H_
 #define FPDFSDK_INCLUDE_JAVASCRIPT_IJAVASCRIPT_H_
 
-#include "../../../core/include/fxcrt/fx_basic.h"
+#include "../../../core/include/fxcrt/fx_string.h"
+#include "../../../core/include/fxcrt/fx_system.h"
 #include "../../../xfa/include/fxjse/fxjse.h"
 
 class CPDF_Bookmark;