SkPDF: clean up extra references

src/pdf/SkPDFResourceDict.cpp

Index: src/pdf/SkPDFResourceDict.cpp
diff --git a/src/pdf/SkPDFResourceDict.cpp b/src/pdf/SkPDFResourceDict.cpp
index 40fc1d8dc902342477b5eb181f334b20f19e33fd..69618de7142553378f201e13bec3ad1101f9e3bf 100644
--- a/src/pdf/SkPDFResourceDict.cpp
+++ b/src/pdf/SkPDFResourceDict.cpp
@@ -72,7 +72,6 @@ SkPDFObject* SkPDFResourceDict::insertResourceAsReference(
         SkPDFResourceType type, int key, SkPDFObject* value) {
     SkAutoTUnref<SkPDFObjRef> ref(SkNEW_ARGS(SkPDFObjRef, (value)));
     insertResource(type, key, ref);
-    fResources.add(value);
 
     return value;
 }