Remove unused m_iRef in CPDFXFA_Page

Refs now live in base class CFX_Retainable.

Change-Id: I5ec3891af91f361c3d2090281efe76dc75c11a40
Reviewed-on: https://pdfium-review.googlesource.com/8670
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_page.h b/fpdfsdk/fpdfxfa/cpdfxfa_page.h
index de2d198..19dc0f2 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_page.h
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_page.h
@@ -76,7 +76,6 @@
   CXFA_FFPageView* m_pXFAPageView;
   CFX_UnownedPtr<CPDFXFA_Context> const m_pContext;
   const int m_iPageIndex;
-  int m_iRef;
 };
 
 #endif  // FPDFSDK_FPDFXFA_CPDFXFA_PAGE_H_