Make more members const in cxfa_ffpageview.h.

Make CXFA_Document::GetCurVersionMode() const as well.

Change-Id: I33cdf922768ca69c490d6531d1b62473bb25745e
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/66814
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/xfa/fxfa/cxfa_ffpageview.h b/xfa/fxfa/cxfa_ffpageview.h
index 65c0b95..99f820e 100644
--- a/xfa/fxfa/cxfa_ffpageview.h
+++ b/xfa/fxfa/cxfa_ffpageview.h
@@ -58,10 +58,10 @@
  private:
   CXFA_FFWidget* GetWidget(CXFA_LayoutItem* pLayoutItem);
 
-  UnownedPtr<CXFA_FFPageView> m_pPageView;
+  UnownedPtr<CXFA_FFPageView> const m_pPageView;
   UnownedPtr<CXFA_FFWidget> m_hCurWidget;
-  uint32_t m_dwFilter;
-  bool m_bIgnoreRelevant;
+  const uint32_t m_dwFilter;
+  const bool m_bIgnoreRelevant;
   CXFA_LayoutItemIterator m_sIterator;
 };
 
@@ -109,10 +109,10 @@
                       bool bMasterPage);
 
   std::vector<UnownedPtr<CXFA_FFWidget>> m_TabOrderWidgetArray;
-  UnownedPtr<CXFA_FFPageView> m_pPageView;
-  uint32_t m_dwFilter;
-  int32_t m_iCurWidget;
-  bool m_bIgnoreRelevant;
+  UnownedPtr<CXFA_FFPageView> const m_pPageView;
+  const uint32_t m_dwFilter;
+  int32_t m_iCurWidget = -1;
+  const bool m_bIgnoreRelevant;
 };
 
 #endif  // XFA_FXFA_CXFA_FFPAGEVIEW_H_