Clean up CPDF_Page.

core/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp

Index: core/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
diff --git a/core/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp b/core/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
index ceca67ceef8cc1b00fa29f50b56afa26701dd91b..addf9e2b0e4f91b9221df979654dc2888eff9226 100644
--- a/core/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
+++ b/core/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
@@ -1119,14 +1119,3 @@ void CPDF_Document::DeletePage(int iPage) {
 
   m_PageList.RemoveAt(iPage);
 }
-
-void FPDFAPI_FlatPageAttr(CPDF_Dictionary* pPageDict,
-                          const CFX_ByteStringC& name) {
-  if (pPageDict->KeyExist(name)) {
-    return;
-  }
-  CPDF_Object* pObj = FPDFAPI_GetPageAttr(pPageDict, name);
-  if (pObj) {
-    pPageDict->SetAt(name, pObj->Clone());
-  }
-}