SkPDF: Refactor SkPDFObject heiararchy.

src/pdf/SkPDFFont.cpp

Index: src/pdf/SkPDFFont.cpp
diff --git a/src/pdf/SkPDFFont.cpp b/src/pdf/SkPDFFont.cpp
index 1a396c7da2181234f104cc7e56f14e0094b5eea4..c9de907dcca42eaa14cf363142a384e36af56899 100644
--- a/src/pdf/SkPDFFont.cpp
+++ b/src/pdf/SkPDFFont.cpp
@@ -1390,10 +1390,8 @@ bool SkPDFType3Font::populate(uint16_t glyphID) {
         SkAutoTDelete<SkMemoryStream> glyphStream(new SkMemoryStream());
         glyphStream->setData(content.copyToData())->unref();
 
-        SkAutoTUnref<SkPDFStream> glyphDescription(
-            new SkPDFStream(glyphStream.get()));
-        charProcs->insert(characterName.c_str(),
-                          new SkPDFObjRef(glyphDescription.get()))->unref();
+        charProcs->insertObjRef(characterName,
+                                new SkPDFStream(glyphStream.get()));
     }
 
     insert("FontBBox", makeFontBBox(bbox, 1000))->unref();