Simplify reference management in SkPDF

src/pdf/SkPDFImage.h

Index: src/pdf/SkPDFImage.h
diff --git a/src/pdf/SkPDFImage.h b/src/pdf/SkPDFImage.h
index a4bc548920cd0d523eafd67806a4c9268e89020b..24332cd02df572b09a0137b0d51b1a7cc9062d9b 100644
--- a/src/pdf/SkPDFImage.h
+++ b/src/pdf/SkPDFImage.h
@@ -54,20 +54,10 @@ public:
 
     virtual ~SkPDFImage();
 
-    /** Add a Soft Mask (alpha or shape channel) to the image.  Refs mask.
-     *  @param mask A gray scale image representing the mask.
-     *  @return The mask argument is returned.
-     */
-    SkPDFImage* addSMask(SkPDFImage* mask);
-
     bool isEmpty() {
         return fSrcRect.isEmpty();
     }
 
-    // The SkPDFObject interface.
-    virtual void getResources(const SkTSet<SkPDFObject*>& knownResourceObjects,
-                              SkTSet<SkPDFObject*>* newResourceObjects);
-
 private:
     SkBitmap fBitmap;
     bool fIsAlpha;
@@ -75,8 +65,6 @@ private:
     SkPicture::EncodeBitmap fEncoder;
     bool fStreamValid;
 
-    SkTDArray<SkPDFObject*> fResources;
-
     /** Create a PDF image XObject. Entries for the image properties are
      *  automatically added to the stream dictionary.
      *  @param stream     The image stream. May be NULL. Otherwise, this