switch surface to sk_sp

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1817383002
CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot,Build-Mac-Clang-x86_64-Release-CMake-Trybot

Review URL: https://codereview.chromium.org/1817383002
diff --git a/gm/imagescalealigned.cpp b/gm/imagescalealigned.cpp
index 66ad8b6..474490f 100644
--- a/gm/imagescalealigned.cpp
+++ b/gm/imagescalealigned.cpp
@@ -73,7 +73,7 @@
         const SkPoint end   = SkPoint::Make(start.x() + vec.x() * (kSegLen - 1),
                                             start.y() + vec.y() * (kSegLen - 1));
 
-        SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(kSegLen, kSegLen));
+        auto surface(SkSurface::MakeRasterN32Premul(kSegLen, kSegLen));
         surface->getCanvas()->clear(SK_ColorTRANSPARENT);
 
         SkPaint paint;