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/src/javascript/global.cpp b/fpdfsdk/src/javascript/global.cpp
index 4dd93c1..84af76a 100644
--- a/fpdfsdk/src/javascript/global.cpp
+++ b/fpdfsdk/src/javascript/global.cpp
@@ -6,7 +6,6 @@
 
 #include "global.h"
 
-#include "../../../core/include/fxcrt/fx_ext.h"
 #include "../../include/javascript/IJavaScript.h"
 #include "JS_Context.h"
 #include "JS_Define.h"
@@ -14,6 +13,7 @@
 #include "JS_GlobalData.h"
 #include "JS_Object.h"
 #include "JS_Value.h"
+#include "core/include/fxcrt/fx_ext.h"
 #include "resource.h"
 
 /* ---------------------------- global ---------------------------- */