update callsites for Make image factories

gm/imagealphathreshold.cpp

 /*
  * Copyright 2013 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 "SkAlphaThresholdFilter.h"
 #include "SkRandom.h"
@@ skipping 84 matching lines @@
 
     void onDraw(SkCanvas* canvas) override {
         SkImageInfo info = SkImageInfo::MakeN32(WIDTH, HEIGHT, kOpaque_SkAlphaType);
         SkAutoTUnref<SkSurface> surface(canvas->newSurface(info));
         if (nullptr == surface) {
             surface.reset(SkSurface::NewRaster(info));
         }
         surface->getCanvas()->clear(SK_ColorWHITE);
         draw_rects(surface->getCanvas());
 
-        SkAutoTUnref<SkImage> image(surface->newImageSnapshot());
         SkPaint paint = create_filter_paint();
         canvas->clipRect(SkRect::MakeLTRB(100, 100, WIDTH - 100, HEIGHT - 100));
-        canvas->drawImage(image, 0, 0, &paint);
+        canvas->drawImage(surface->makeImageSnapshot().get(), 0, 0, &paint);
     }
 
 private:
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new ImageAlphaThresholdGM();)
 DEF_GM(return new ImageAlphaThresholdSurfaceGM();)
 
 }