Merge to XFA: Fix all relative includes to core.

Do some IWYU to fix build errors due to files that have no #includes but
just happened to work previously because the #includes were in the right
order.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1407423004 .

(cherry picked from commit 9e7cd8ffb81c564e1102f6c6459ec0942a0b11ea)

Review URL: https://codereview.chromium.org/1425163004 .
diff --git a/fpdfsdk/include/javascript/IJavaScript.h b/fpdfsdk/include/javascript/IJavaScript.h
index 291b8f1..f654696 100644
--- a/fpdfsdk/include/javascript/IJavaScript.h
+++ b/fpdfsdk/include/javascript/IJavaScript.h
@@ -7,9 +7,9 @@
 #ifndef FPDFSDK_INCLUDE_JAVASCRIPT_IJAVASCRIPT_H_
 #define FPDFSDK_INCLUDE_JAVASCRIPT_IJAVASCRIPT_H_
 
-#include "../../../core/include/fxcrt/fx_string.h"
-#include "../../../core/include/fxcrt/fx_system.h"
 #include "../../../xfa/include/fxjse/fxjse.h"
+#include "core/include/fxcrt/fx_string.h"
+#include "core/include/fxcrt/fx_system.h"
 
 class CPDFDoc_Environment;
 class CPDFSDK_Annot;