switch surface to sk_sp

bench/DisplacementBench.cpp

Index: bench/DisplacementBench.cpp
diff --git a/bench/DisplacementBench.cpp b/bench/DisplacementBench.cpp
index c22b8fd2d14b776db1f53b4348618862cadf343e..eadafb662207f06ecd2792effb6b3c508048576d 100644
--- a/bench/DisplacementBench.cpp
+++ b/bench/DisplacementBench.cpp
@@ -48,7 +48,7 @@ protected:
     void makeCheckerboard() {
         const int w = this->isSmall() ? FILTER_WIDTH_SMALL : FILTER_WIDTH_LARGE;
         const int h = this->isSmall() ? FILTER_HEIGHT_LARGE : FILTER_HEIGHT_LARGE;
-        SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(w, h));
+        auto surface(SkSurface::MakeRasterN32Premul(w, h));
         SkCanvas* canvas = surface->getCanvas();
         canvas->clear(0x00000000);
         SkPaint darkPaint;