Make CPDF_PageObject::m_Rect a private member.

Because it already isn't used outside the class.

Change-Id: I0ea16360ecffb2f7321dbf2cc311228dad9c868d
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/96515
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/core/fpdfapi/page/cpdf_pageobject.h b/core/fpdfapi/page/cpdf_pageobject.h
index b88be0c..14b0a9b 100644
--- a/core/fpdfapi/page/cpdf_pageobject.h
+++ b/core/fpdfapi/page/cpdf_pageobject.h
@@ -88,9 +88,8 @@
  protected:
   void CopyData(const CPDF_PageObject* pSrcObject);
 
-  CFX_FloatRect m_Rect;
-
  private:
+  CFX_FloatRect m_Rect;
   CFX_FloatRect m_OriginalRect;
   CPDF_ContentMarks m_ContentMarks;
   bool m_bDirty = false;