Fix memory leak in MultiPictureDraw GM

gm/multipicturedraw.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 
 #include "SkColorFilter.h"
@@ skipping 389 matching lines @@
         }
 
     protected:
         Content          fContent;
         Layout           fLayout;
         const SkPicture* fPictures[kNumPictures];
 
         virtual void onOnceBeforeDraw() SK_OVERRIDE {
             fPictures[0] = make_hex_plane_picture(SK_ColorWHITE);
             fPictures[1] = make_hex_plane_picture(SK_ColorGRAY);
-            fPictures[2] = SkRef(make_sierpinski_picture());
+            fPictures[2] = make_sierpinski_picture();
         }
 
         virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
             SkMultiPictureDraw mpd;
             SkTArray<ComposeStep> composeSteps;
 
             // Fill up the MultiPictureDraw
             (*gLayoutMthds[fLayout])(canvas, &mpd, 
                                      gContentMthds[fContent], 
                                      fPictures, &composeSteps);
@@ skipping 54 matching lines @@
                                                 MultiPictureDraw::kTiled_Layout));)
     DEF_GM(return SkNEW_ARGS(MultiPictureDraw, (MultiPictureDraw::kRRectClipMulti_Content,   
                                                 MultiPictureDraw::kTiled_Layout));)
     DEF_GM(return SkNEW_ARGS(MultiPictureDraw, (MultiPictureDraw::kPathClipMulti_Content,    
                                                 MultiPictureDraw::kTiled_Layout));)
     DEF_GM(return SkNEW_ARGS(MultiPictureDraw, (MultiPictureDraw::kInvPathClipMulti_Content, 
                                                 MultiPictureDraw::kTiled_Layout));)
     DEF_GM(return SkNEW_ARGS(MultiPictureDraw, (MultiPictureDraw::kSierpinski_Content,
                                                 MultiPictureDraw::kTiled_Layout));)
 }