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/tests/RecorderTest.cpp b/tests/RecorderTest.cpp
index 59d5a8e..a709a51 100644
--- a/tests/RecorderTest.cpp
+++ b/tests/RecorderTest.cpp
@@ -74,7 +74,7 @@
 
     sk_sp<SkImage> image;
     {
-        SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(100, 100));
+        auto surface(SkSurface::MakeRasterN32Premul(100, 100));
         surface->getCanvas()->clear(SK_ColorGREEN);
         image = surface->makeImageSnapshot();
     }