Simplify reference management in SkPDF

src/pdf/SkPDFResourceDict.h

Index: src/pdf/SkPDFResourceDict.h
diff --git a/src/pdf/SkPDFResourceDict.h b/src/pdf/SkPDFResourceDict.h
index 17ea338f59a38a5968567224403eed486951d1d5..fa9bb448c893f1f64cfcb268108125a2e695488f 100644
--- a/src/pdf/SkPDFResourceDict.h
+++ b/src/pdf/SkPDFResourceDict.h
@@ -55,20 +55,6 @@ public:
                                            SkPDFObject* value);
 
     /**
-     * Gets resources inserted into this dictionary as a reference.
-     *
-     * @param knownResourceObjects Set containing currently known resources.
-     *     Resources in the dict and this set will not be added to the output.
-     * @param newResourceObjects   Output set to which non-preexisting resources
-     *     will be added.
-     * @param recursive            Whether or not to add resources of resources.
-     */
-    void getReferencedResources(
-            const SkTSet<SkPDFObject*>& knownResourceObjects,
-            SkTSet<SkPDFObject*>* newResourceObjects,
-            bool recursive) const;
-
-    /**
      * Returns the name for the resource that will be generated by the resource
      * dict.
      *