Remove SkRefPtr

(resubmit of https://codereview.appspot.com/7030059/)
TBR=junov@google.com

Review URL: https://codereview.appspot.com/7030065

git-svn-id: http://skia.googlecode.com/svn/trunk@7030 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/pdf/SkPDFPage.h b/src/pdf/SkPDFPage.h
index 8ef909e..72ba335 100644
--- a/src/pdf/SkPDFPage.h
+++ b/src/pdf/SkPDFPage.h
@@ -91,10 +91,10 @@
 
 private:
     // Multiple pages may reference the content.
-    SkRefPtr<SkPDFDevice> fDevice;
+    SkAutoTUnref<SkPDFDevice> fDevice;
 
     // Once the content is finalized, put it into a stream for output.
-    SkRefPtr<SkPDFStream> fContentStream;
+    SkAutoTUnref<SkPDFStream> fContentStream;
 };
 
 #endif