Update MagnifierImageFilter to sk_sp

gm/imagemagnifier.cpp

 /*
  * Copyright 2012 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 "SkMagnifierImageFilter.h"
 #include "SkRandom.h"
 
 #define WIDTH 500
 #define HEIGHT 500
 
 DEF_SIMPLE_GM_BG(imagemagnifier, canvas, WIDTH, HEIGHT, SK_ColorBLACK) {
         SkPaint filterPaint;
         filterPaint.setImageFilter(
-            SkMagnifierImageFilter::Create(
+            SkMagnifierImageFilter::Make(
                 SkRect::MakeXYWH(SkIntToScalar(100), SkIntToScalar(100),
                                  SkIntToScalar(WIDTH / 2),
                                  SkIntToScalar(HEIGHT / 2)),
-                100))->unref();
+                100, nullptr));
         canvas->saveLayer(nullptr, &filterPaint);
         const char* str = "The quick brown fox jumped over the lazy dog.";
         SkRandom rand;
         for (int i = 0; i < 25; ++i) {
             int x = rand.nextULessThan(WIDTH);
             int y = rand.nextULessThan(HEIGHT);
             SkPaint paint;
             sk_tool_utils::set_portable_typeface(&paint);
             paint.setColor(sk_tool_utils::color_to_565(rand.nextBits(24) | 0xFF000000));
             paint.setTextSize(rand.nextRangeScalar(0, 300));
             paint.setAntiAlias(true);
             canvas->drawText(str, strlen(str), SkIntToScalar(x),
                              SkIntToScalar(y), paint);
         }
         canvas->restore();
 }