Mark ProgressiveDecoder::HorzTable instance variables as private

Because they already are private from caller's perspectives.

-- do the same for VertTable.

Change-Id: I3d4bb6b4a2b24ff395d6545a61844d4b958ea379
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/96690
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/core/fxcodec/progressive_decoder.h b/core/fxcodec/progressive_decoder.h
index 9a445d7..b8c6b5a 100644
--- a/core/fxcodec/progressive_decoder.h
+++ b/core/fxcodec/progressive_decoder.h
@@ -136,6 +136,7 @@
                                             pixel * m_ItemSize);
     }
 
+   private:
     int m_ItemSize;
     DataVector<uint8_t> m_pWeightTables;
   };
@@ -150,6 +151,8 @@
       return reinterpret_cast<PixelWeight*>(m_pWeightTables.data() +
                                             pixel * m_ItemSize);
     }
+
+   private:
     int m_ItemSize;
     DataVector<uint8_t> m_pWeightTables;
   };