PDF: why do we have flags no one uses (or can use)?

src/pdf/SkPDFCatalog.h

Index: src/pdf/SkPDFCatalog.h
diff --git a/src/pdf/SkPDFCatalog.h b/src/pdf/SkPDFCatalog.h
index 280da669636f215eb0b58f66fca1a0a212d4ac02..9175f6255fe3adb23e95b56b1c8fe4b80c008267 100644
--- a/src/pdf/SkPDFCatalog.h
+++ b/src/pdf/SkPDFCatalog.h
@@ -26,7 +26,7 @@ class SkPDFCatalog {
 public:
     /** Create a PDF catalog.
      */
-    explicit SkPDFCatalog(SkPDFDocument::Flags flags);
+    SkPDFCatalog();
     ~SkPDFCatalog();
 
     /** Add the passed object to the catalog.  Refs obj.
@@ -48,10 +48,6 @@ public:
      */
     int32_t getObjectNumber(SkPDFObject* obj);
 
-    /** Return the document flags in effect for this catalog/document.
-     */
-    SkPDFDocument::Flags getDocumentFlags() const { return fDocumentFlags; }
-
     /** Output the cross reference table for objects in the catalog.
      *  Returns the total number of objects.
      *  @param stream      The writable output stream to send the output to.
@@ -106,8 +102,6 @@ private:
     // Next object number to assign on the first page.
     uint32_t fNextFirstPageObjNum;
 
-    SkPDFDocument::Flags fDocumentFlags;
-
     int findObjectIndex(SkPDFObject* obj);
 
     int assignObjNum(SkPDFObject* obj);