Switch SkSpecialImage & SkSpecialSurface classes over to smart pointers

src/effects/SkPaintImageFilter.cpp

Index: src/effects/SkPaintImageFilter.cpp
diff --git a/src/effects/SkPaintImageFilter.cpp b/src/effects/SkPaintImageFilter.cpp
index 6ae62d9112dd443065459cc9eac2e103ef14b4da..02387cefc3602336fd3a28fe0de363d5a565e349 100644
--- a/src/effects/SkPaintImageFilter.cpp
+++ b/src/effects/SkPaintImageFilter.cpp
@@ -45,7 +45,7 @@ SkSpecialImage* SkPaintImageFilter::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;
     }
@@ -67,7 +67,7 @@ SkSpecialImage* SkPaintImageFilter::onFilterImage(SkSpecialImage* source,
 
     offset->fX = bounds.fLeft;
     offset->fY = bounds.fTop;
-    return surf->newImageSnapshot();
+    return surf->makeImageSnapshot().release();
 }
 
 bool SkPaintImageFilter::canComputeFastBounds() const {