Switch SkSpecialImage & SkSpecialSurface classes over to smart pointers

src/effects/SkOffsetImageFilter.cpp

Index: src/effects/SkOffsetImageFilter.cpp
diff --git a/src/effects/SkOffsetImageFilter.cpp b/src/effects/SkOffsetImageFilter.cpp
index 77cf4423844af2207ff821ff49b95e0c80e93cad..f3d2bb0c5897ebdb6e1bbf0b374ad4051aa2957d 100644
--- a/src/effects/SkOffsetImageFilter.cpp
+++ b/src/effects/SkOffsetImageFilter.cpp
@@ -41,7 +41,7 @@ SkSpecialImage* SkOffsetImageFilter::onFilterImage(SkSpecialImage* source,
 
         SkImageInfo info = SkImageInfo::MakeN32(bounds.width(), bounds.height(),
                                                 kPremul_SkAlphaType);
-        SkAutoTUnref<SkSpecialSurface> surf(source->newSurface(info));
+        sk_sp<SkSpecialSurface> surf(source->makeSurface(info));
         if (!surf) {
             return nullptr;
         }
@@ -61,7 +61,7 @@ SkSpecialImage* SkOffsetImageFilter::onFilterImage(SkSpecialImage* source,
 
         offset->fX = bounds.fLeft;
         offset->fY = bounds.fTop;
-        return surf->newImageSnapshot();
+        return surf->makeImageSnapshot().release();
     }
 }