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/resource.h b/fpdfsdk/include/javascript/resource.h
index 88011f2..4337859 100644
--- a/fpdfsdk/include/javascript/resource.h
+++ b/fpdfsdk/include/javascript/resource.h
@@ -7,7 +7,7 @@
 #ifndef FPDFSDK_INCLUDE_JAVASCRIPT_RESOURCE_H_
 #define FPDFSDK_INCLUDE_JAVASCRIPT_RESOURCE_H_
 
-#include "../../../core/include/fxcrt/fx_basic.h"  // For CFX_WideString.
+#include "../../../core/include/fxcrt/fx_string.h"  // For CFX_WideString.
 #include "../fsdk_define.h"  // For FX_UINT.
 
 class CJS_Context;