Transform rect out param from reference to pointer in XFA code.

Change-Id: Ib5f8b8754bca8198d9122700d7d876b45d1428da
Reviewed-on: https://pdfium-review.googlesource.com/31852
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
diff --git a/xfa/fwl/cfwl_widget.h b/xfa/fwl/cfwl_widget.h
index 66ec0e1..85f9b76 100644
--- a/xfa/fwl/cfwl_widget.h
+++ b/xfa/fwl/cfwl_widget.h
@@ -134,7 +134,7 @@
                     IFWL_ThemeProvider* pTheme,
                     const FDE_TextStyle& dwTTOStyles,
                     FDE_TextAlignment iTTOAlign,
-                    CFX_RectF& rect);
+                    CFX_RectF* pRect);
   void SetGrab(bool bSet);
   void RegisterEventTarget(CFWL_Widget* pEventSource);
   void UnregisterEventTarget();